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Chevy Silverado and GMC Sierra Real World MPG Numbers



  • coontie57coontie57 Posts: 128
    Yes I know that. Ford 250 Diesel = 29 gallons... Chevy 2500 Duramax = 26 gallons.

    The other had a 6 L gas engine in his Chevy and his mpg was less than the diesel AND his tank was smaller so I let him lead the procession from one gas station to another. He quit and got more fuel sometimes when I didn't. When we BOTH went from one station to another his consumption was much greater ie, he bought more fuel / liters or gallons depending on where we were. We traveled together for about 3.5 months.
  • jklingel8jklingel8 Posts: 10
    Just picked up an '07 3500 4x4, turbo Duramax w/ Allison 6-spd, SRW. From Anchorage to Frb, 350 miles, rolling hills and some descent hills around Nenana, we got 20.5 mpg. Traveled mostly 60-65 mph. I was amazed that the rpm, 1600 at 65 mph, never changed on the uphills. My '93 F350 w/ a non-turbo 7.3 liter would have r'd way up and the after-burner kicked in many, many times. So far, so good.
  • rman6rman6 Posts: 11
    Why is everyone so high on the diesels? If you're towing a heavy trailer often, then maybe they make sense. But for standard driving and a little towing is the extra cost and noise worth it? Not to mention they're not as responsive as gas, and although they've come a long way, you still can't just jump in them and go. You've got to wait for the glowplugs, then the motor to warm up. I'm not buying a soccer mom pickup, but I'm not towing around a cat or an 8 horse trailer either. There's only been one response to the 6.0 motor. What kind of mileage does it get, and what is the overall quality of these chevy 3/4 tons? I'm a ford guy who's looking to cross over. All I know about Chevy is that they built a really poor diesel for a long time and the 350 was probably the greatest motor ever made. Plus they're about $3500 cheaper than the new fords.
  • coontie57coontie57 Posts: 128
    There are a lot of different stories on the Fords. I had a 1999 250 diesel (7.3L) and the engine was fine... but the tranny was a problem. No problems until 72.500 miles then the skids just fell out of the Ford. Two transmissions... and a clip on A fuel injector plug... I sold it at 109,000 miles. I liked the way it drove.. I liked the interior ... very good visibility... and personally I liked the seats.. plush cloth?? My wife and a friend have both had back surgery and neither could stand to ride in it... back aches.. I had no problems.

    The diesel Ford got 20 or a little better on the road by itself and a friend of mine with a 6L gas chevy 2500 model is good for about 13 or so.. I think the newer ones might do some better but still way off the 20mpg on the road that both the Ford and my new Chev get.

    As far as starting both... the Ford you had to wait on a bit... but not the chevy but its newer... perhaps the Ford is quicker to start now.. they are both much quiter now then in 99.. The noise INSIDE the pu just isn't a problem or issue.. With the new Chev I actually ground the starter last year when I first got it because I couldn't hear it running. I have not done it since..

    A friend and I pulled our 8-9K campers to Alaska two years ago beginning May 12th.... the difference in fuel mileage between the diesel and the gas PUs was truly something to see. Stop after Stop after stop he put in much more fuel and we HAD to use the same gas stations as that's all there is... about every 100 miles. Our two campers were the same weight... same model and make... Two trucks... a 99 Ford Diesel ... a 2002 Chevy 6L gas.. Between the two of us we drove about 28,000 miles on that trip just under 4 months and didn't have a single PU problem... either of us.. The 6L gas engine pulled the Canadian mtns and those in AK just fine... perhaps better than the 99 Ford. But it made it just fine.. Ford Motor Co didn't see fit to give me a transmission temp guage so when the Chevy would stop to cool down I did too. There were several times when the EGT got nearly too hot so I had to hold back on the throttle to keep the turbine from getting too hot.

    We both NOW own 06 Chevy Duramax Diesel PUs.. We both bought larger campers .. more weight... and they pull the weight just fine.. 12000 lbs perhaps for me..less for him... 11.5mpg is the best I have gotten so far on flat land in FL pulling the camper... 10.5 on the interstate with big hills or NC mtns. OnStar just sent me an email sayhing I have 11,050 miles on it now so its still not broken in yet. Pulling my 21 ft bass boat (200 hp) it gets about 15-16.5mpg..and that's about the best you could hope for with a 6L gas engine with nothing in tow or onboard...

    Inside the chevy the seats are nice ... leather... very comftrable and the wife's back doesn't hurt... The XM radio is neat and the ONSTAR is just there till July .. I have never had heated seats before and that was a nice surprise this winter.

    Hope I answered your questions.

    I certainly don't have anything against Ford... I liked mine... and would still own it but the tranny deal was expensive and based on my experience I thought I could expect more trouble.. Ford did nothing to help me with this by the way except to take my $2850 for the first one... the second one was under warranty. Ford Motor Co and the local dealer played the good cop : bad cop deal to the max.. It was nearly funny with each pointing to the other..

    Something to also consider is the problem Ford is having NOW with their diesel engine manufacturer... I hear they are being sued by them.. or the other way around.. The two are not happy campers right now anyway. Can't remember what the problem was.. tardiness in production or something..

    I don't know what the gross towing capacity of the 6 L engine is but it used to be around 10,000,,, the 06 Chev diesel is/was 15,500 lbs as I recall. I was told early in life to not operate equipment/machinery near the capacity of the unit but somewhere within the middle range of the equpment... WELL that's what I was told anyway so that's partly why I like the diesel.. I am several thousand pounds under what it is listed as its capacity to haul.
  • kipkkipk Posts: 1,576

    Got some questions, hope you guys and gals have some answers! :confuse:

    Is there any type of indicator, such as a light, to let the driver know if the 5.3 is in 4 cylinder or 8 cylinder mode?

    Does the engine switch to 4 cylinder mode only at "LIGHT" cruising applications, or will it also use 4 cyl when idling or driving around local and back roads with a very light foot?

    Is there a "Real Time MPG" display as well as the "Average Mileage" one?

    If so, are the above in a particular package or trim level?

  • nascar57nascar57 Posts: 47
    Yes on the 07 Chev's there is a display that instantly reads out V8 Mode or V4 Mode, this is displayed on the screen the same time as the instantaneous mileage is shown. There is another screen that shows overall average mileage. As far as I have experienced with my pickup, if you make your foot a little bit lighter the V4 will in fact help you out with overall mileage. If you can keep the cruising speed under 70 mph, it will work but once the pickup gets over 70, I rarely see mine switch into V4. As far as I know, this is available on all of the Silverado's, no special package needed, mine is an LT1 and every pickup I have seen has it on. They are a dream to drive. One other thing for people reading this, there is a new fuel additive that has been stirring up excitement here in the heartland. It is a product made in Minnesota and has been delivering a 10-15% minimum increase in gas mileage. I have friends that have used it, went from 17 in their pickups to 18.5-19 automatically. It is called CA40G, there is a web site you all should visit This stuff is pretty amazing from what I've heard, I have a gallon on order and will report back. It works with any fuel (Gas, Diesel, E85) Would really help if everyone instantly got a 15% reduction in consumption.
  • bkerchakbkerchak Posts: 9
    Just purchased a 07 Silverado Ext Cab with 4.8 V8 and 3.23 gear ratio that is rated at 16 city and 20 highway. I drive a combo of city and highway miles each day. Can I expect the mileage as advertised on the sticker or will it be less ? What changes or add-ons to the truck would help improve or maintain the 16/20 numbers ? Thanks for the feedback !
  • oakradoakrad Posts: 2
    What are you getting for fuel mileage from your 2007 Chevy Silverado? I have around 350 miles on mine and the obc says it is averaging around 13.9. I have the 5.3L with 3.73 rear end and 4wd.
  • lionclawzlionclawz Posts: 12
    I have the 5.3, 2x4 and I avg 19.2 hwy, 16.9 city.
    Xtended cab LTZ - currently have little over 4000 mi.
  • bkerchakbkerchak Posts: 9
    I have an 07 4.8 4x2 with 3.23 rear end and I recently got 15 mpg on my first tank full of 87 octane doing city driving with the a/c second and third tanks were from a road trip to my cabin that is 300 miles each way of strictly highway driving and I averaged 19 mpg......not bad for a brand new engine that is just getting broken in......I would say that the sticker mpg of 16/20 are true if you stay at 65 and don't mash the pedal....all in all a great truck with good mileage that you can load up with all of your gear and the kids......
  • I have a 5.3 4x2 3.73 (whichever ratio) 245 r17 tires and have almost 7k miles. I would think GM could do better for us who do not want 4wd to be able to get a min of 22 mpg. That truly is not too much to ask for a consumer who pays 30k for a truck. Yes, I know it is a truck but this technolgy we have today can do better. I also have the flex fuel option......E85 what a savings. I can buy gas at $3.05 in Michigan for 87 O and then buy E85 at $2.85....The saving well it is not a savings if you do the math. On a full tank of gas you lose over 60 miles per tank. That is about 4 gallons of gas. If you bought 87 O you would have went further...I know, I know, you save the environment...If you just bought E85 all year per tank you would lose $7.00 per tank. If you fill up once every week it would cost you an extra $364 a year. That is just about a truck payment. The consumer is always paying...we pay for the green of the environment and the vehicle....where does the manufacturer come in?????
    Frustrated on the gas situation.
  • nascar57nascar57 Posts: 47
    Yes, Ethanol does drop the mileage that you get. I live up in North Dakota and here E85 is selling for $2.54 and regular 87 Octane gas is at $3.09. With that spread you are a little better off running the ethanol. I have figured that on my 07 silverado I need ethanol to be at least $.50/gallon cheaper to make it even out. After that it works out, too bad that there isnt something that can be added to ethanol to bump the energy content.
  • Just paid $2.57 a gallon for 87 octane and prices should continue to drop until hurricane Dean hits land and then the refineries will say that there is another shortage.... with 1500 miles on my 07 4x2 with 3.23 ratio and the 4.8 v-8....I am getting almost 17 city and right around 21 highway....the same mileage that I got with my 92 Sonoma with the 4.3 v-6....I was told at he dealership that I should use Shell gasoline because they still put detergents in their fuels....If you don't use Shell they told us to add a fuel injector cleaner to the tank.....any thoughts on this ?
  • zeeboyzeeboy Posts: 25
    I've been searching for 4.8l/3.23 mileage and it seems like a few years ago seeing 17-20 real world mpg (mixed) was the norm.

    Now the NBS seems to get 13-16 mpg?

    What changed on the regular cab to drop the mileage? I'm aware the new EPA ratings changed, but again I'm looking at owner's report mpg.
  • olz442olz442 Posts: 2
    Getting the rated 18 city 22 highway with my Canyon, I was looking forward to getting similar numbers with a 2007 V8 Sierra thanks to the "advertised" active fuel management. So, since no one locally had a regular cab 4x4, I just drove 900 miles round trip to take advantage of the current rebate to "buy" my new Sierra.

    After getting there, the wife and I naturally went for a long test drive and I placed the dash display in AFM readout mode. Once the vehicle got past about 62 MPH, AFM never engaged once. Never leaving V8 mode, the instantaneous mileage varied from 13-19mpg with the vehicle on cruise control about 68mph. Now, if you drop below about 62MPH, then the AFM would engage and you would see a noticeable instantaneous mpg difference when it would enter V4.

    Question: How many people cruise down the highway below 62mph? :confuse:

    The sales person called his GM certified tech who responded by saying especially the 4x4s require all 8 cylinders above about that speed. Sadly, I drove back home with my Canyon but at least I learned of this during the test drive instead of after the purchase. I personally find this to be false or certainly misleading advertising. My '99 Sierra 5.3 V8 would get 16 city 20 highway without AFM. The 2007 ranging between 13 and 19 mpg on cruise control at 68mph, there's no way it's ever going to get 20 highway without a BIG asterisk *Below 62mph only. And this was just a regular cab version that's 600 pounds lighter than the extended cab and 700 pounds lighter than the crew. I can't imagine what kind of mileage they're going to get.

    Any chance GM would refund my trip expenses :mad: ?

    Thought those of you in the market should keep this in mind so you don't learn the hard way. I've seen others on this forum and elsewhere complaining about horrible mileage and just attributed it to lead-foot syndrome. I think they're just unfortunately experiencing in ownership what I saw during my test drive. When you're on cruise control, it's hard to blame your right foot. :(
  • Ok, i have a 99 silverado ext cab 5.3 v8 4x4 and i get 16 highway and 10-a2 city. is that cuz im in highschool and drive 2 hard on the pedal?
  • First of all, that's not true. I admit, over 75, it hardly ever kicks in. my new 07, purchased 3 weeks ago went on a 200 mile trip last weekend at 65, I was in V4 mode for 50% of the trip getting 22ish mpg. this is a 4x4 quad cab Z71 too. honestly, the biggest problem I have with milage is that i can't keep my foot away from those ponies.
  • bobw1bobw1 Posts: 19
    I am looking at a 2008 4x2 Silverado with the 5.3 engine. Should I get the iron block version or the flex fuel one? Will there be a difference in MPG or engine life or performance? Thanks...
  • Though I'm thrilled you're apparently getting yours to actually go into V4 mode above 62, saying what I said is a lie is completely irresponsible. I drove 900 miles round trip to buy a new Sierra based on believing that AFM worked as advertised. The fact is that both going out and coming back on a LONG test drive with cruise control set to 68MPH, the truck never once entered V4 mode and I was getting instantaneous mileage between 13-19. You can't blame a lead foot when the cruise is set to 68 and you can't blame hills or the wind when it does it both directions. As I backed the cruise control down, when I would hit about 62MPH the truck would start to very intermittently go in and out of V4 and below 60 would go in and out frequently. That IS what happened. Period. What possible motive would I have to lie? That is after all the reason the new Sierra remained on the lot and the wife and I returned home in our Canyon. I thought others should know for those that think believable gas mileage is as important part of a new vehicle purchase as I do and maybe just maybe this technology has a few holes in it yet since others are complaining about horrible mileage too. I'll keep driving my Canyon in the meantime that actually hits and sometimes exceeds its MPG rating. Just got 23.5 on a trip to/from Colorado in it @70MPH and it's only rated at 22 HW.
  • I am very impressed with the mpg on my 2007 4x4 crew cab z71 w/6.0 L engine. On a 350 mi. trip shortly after I bought the truck I got 18.2 mpg overall. This is before the engine was even broken in. On another note the on-board computer is very accurate. It showed 18.2, and I calculated 18.2 based on my fill-up.

    The truck frequently goes into afm mode below 70 mph, and occasionally between 70-75 mph. 74-75 mph seems to be the cutoff where the afm won't engage any more. I think it would easily meet (or exceed) the 19 mpg highway rating if I stayed at 65. BTW my trip was mostly in cruise control. That is key to getting good mpg. The trip also included about 10% mountain driving, but it is interstate thru those mtns. and the speeds were about 70 mph.

    In lousy stop-n-go Los Angeles traffic I get 14-15, which is as good as I can expect.

    AFM really works. As long as it is reliable, I am sold on it.

    I recently bought a pop-up trailer, approx. 2400 lbs. empty. I am curious what my mpg will be while towing. Will post when I have some data.

  • 1offroader, I'm getting good results too - I got an 07 Crew Cab MAX with 4:10 gearing, but I lifted it 3" and put on 33"s so I'm at about 3.85 effective ratio. Still, I got 17 mpg on a recent 600 mile trip which included a lot of "hammer time" passing RV's, mountain passes, hills, etc. I think I could have squeaked out 18 if I had been gentle. I'm getting about 14-15 in town easy driving.

    The bottom line is that there will always be some flat driving, downhill time, tail winds, etc where the AFM will engage and save fuel. I've actually seen it engage while pulling my 5000# Camper. There will also be times when you'll never see AFM engage - High speed highway driving, hot day - AC running all the time, head wind etc. Still, I'm sold on the technology.

    One potential problem is that the system does not rotate the cylinders that it disengages... i.e. the same 4 cylinders always turn off. Over time, will the uneven wear cause problems? With the tight tolerances and better materials used in these new engines, it may never be an issue, but my instincts lead me to believe that it could be.... Time will tell
  • summit

    The issue of uneven cylinder wear should not be a problem. The pistons in those cylinders are still moving up and down - they have to, they're connected to the crank shaft. They just aren't drawing in fuel and firing because the valves are de-activated. I wouldn't worry about uneven wear, that's not going to be a problem IMO.

  • You're probably right... I was thinking more in terms of uneven carbon depositing on the valves, seats, injectors etc. Still, things are made so tightly today that it's probably not an issue at all. I love my new Silverado!

  • I am thinking about putting a tonneau cover on my 07 new body style silverado ext cab. I am interested in a tri-fold but I am worried that the black plastic on the tailgate will interfere with the cover. Does anyone have any suggestions on types of covers or if this would be a problem. Thanks for the info.
  • If your getting lousy mpg and your buddy is not check to see which 5.3 you have? The aluminum block will get the lower millage than the cast iron block in my experience.
    My aluminum block with 310 hp gets average of 14.1 while my cast iron block 290hp will get 18mpg average and up to 21 mpg on the highway at 70 mph.
  • z15z15 Posts: 2
    I have an 08 Sierra 4x4 SLT Z71 E-Cab iron block 5.3

    I have seen mine go into 4 cyl mode about 65 mph while on cruise control. If you are not on cruise control any pressure on the pedal will not allow it the select the V4 mode. If the rpm goes up 1 it will kick into V8.

    About 5,000 mile on my truck. I was avg 18.3 mph till the winter weather hit and its dropped to about 17.6 but I have it in AUTO 4x4 mode all the time, snowing for 2 weeks straight and roads are mostly snow covered or slippery.

    A recent 500 miles trip I average 19.7 mpg on relatively flat county on cruise control at 65mph. Coming back I was carrying about 700 lbs of cargo. I also changed all the lubricants in my truck to synthetic, the engine, both axles and the transmission.
  • I'm in the market for a new Sierra/Silverado. I currently have a 06 1500HD Crew 2WD. Happy with the power, but getting 11MPG. Would like to get 4WD and improve the MPG from the 11. The 1500 with 5.3/3.73 with AFM would probably fit most of my needs. However, there are a few times I probably would be better off with a 3/4 or one ton. Question is what are you guys getting with the 6.0 and new 6 spd in the HD. As stated above, the 5.3 would probably fit the needs, but if the current 6.0 with the 6 spd is getting over 15 regularly, I'd prefer that setup. I see GM has the 6.0 with the AFM in the 1500 series. Is the AFM coming to 2500/3500 or is that just silly?
  • Well, I have the 5.3 on my "new" chevy 1500 2wd extended cab that is supposed to have the AFM. Ive put 22,000 miles on it since memorial day and have yet to achieve anything better than 18-19 (19 on a good day) MPG. BTW, the sticker said 22 hiway.

    My question for those who know, is if you have the truck without the DIC buttons, how would you know if AFM is active or not? The book says there is a display regardless of whether you have the DIC buttons or not, but fails to mention how one would know.

    I drive many days from gas station to gas station only touching the brake pedal and ignition when I leave the first station, stopping at the next one. 60-65 mph, cruise on, all highway. I drove 948 miles this week and might have achieved 18 mpg if I rounded it up. I generally get about 400 - 420 miles per tank and my fill ups are between 22.5 - 24.5 gallons. My simple math tells me that if I were to get even 20mpg, I should go 440 miles on 22 gallons of gas.

    No, I dont see any indication that AFM even exists. The serial number says it has it, the sticker says it has it, but other than that, there is no indication that it exsists or if it does, that it functions. Ive even driven 2 tank fulls with the trailer button depressed only to find the same exact milage.

    I love the truck, dont get me wrong. It's not the most comfortable for 6 or 8 straight hours, but it's a truck. My question remains. How would one know when the engine goes to 4 cyl. My next question (assuming there is no way for joe truck owner to know) is how would the dealership test it? Can they hook a computer up to it and see it function, can they engage the EFI manually or however AFM works? How can they show me that it is doing what it says it is or for that matter, even show me that it's installed?

    18 is ok? Thats 20% off the sticker. What if your wife was in the grocery store, bought $100 worth of groceries, and the store constantly failed to load more than 80% of those groceries in her trunk? What if you bought an air conditioner rated at 16 SEER only to find out it was a 13 SEER? What if the fuel stations only delivered 80% of the fuel the pump said it did?

    All I want to know is... Is it there, and if so, does it work (show me). It's a shame a coworker who has the same truck except his is 4wd and he gets over 20 per gallon with the same monthly miles and same type of driving.
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