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Pontiac Grand Prix: Real World MPG

Karen_SKaren_S Posts: 5,093
Share with other Grand Prix owners your actual MPG.


  • Nice to hear about the 26-27 mpg ocmike. I'll see if I can top that :shades:

    I'm getting really jazzed...still waiting for my gxp to be delivered. Should be any day now.

    By the way, Gxp Mpg sounds like a good Serbian name, or a heckuva Scrabble word.
  • What color? Loaded?? Just got mine (Stealth Gray) and got to drive it finally, was out of town right after I picked it up. OH MY GOD.....I love this thing. I mean all I was doing was errands and I was having a blast. Filled up, only need 7 gallons, used mid-grade (do folks see the difference in fuel type?) but was getting 21.9 MPG mostly cityish driving and having quite a bit of fun.

    You will love it when you get it.

    PS one BMW guy and and two Maxima's just stared in the parking lot.

    PPS: My sun clip on my prescription glasses, filters out the light frequency of the HUD. Anybody else have this one?

    With too big of grin,

    Bubbaman :)
  • What color? Blue/green crystal. From what I've seen, it looks totally sweet. Interior: Tan leather.
    Base radio -- I'm adding upgraded speakers. Side airbags...but NO SUNROOF! I can't stand the things cuz I'm always hitting my heads on them, on just about any make or model.
  • Yes, I wanted the Monsoon system so had to get sunroof. Being short the room is no problem, but with my allegies, won't be open much. I would have liked to get the tunes without the need for the sunroof. From what I have seen in the inventory around the DFW area, almost all GXPs on the lot have both leather and sun and sport. Couldn't find one on the lot to deal without it. Enjoy your car when you get it.

  • gxp4megxp4me Posts: 7
    Hey Bubba ... yeah I have the same problem with my sunglasses too. It is because they are polarized ... I know that if I stare straight ahead it almost filters the HUD completely but if I tilt my head to the side slightly it comes back a little bit.

    No problems though! ;)
  • Did you get your GXP yet? I am on my second tank and with some fun and city/hwy mix am getting 21.9 and 23 MPG, by my calculations. The Average on the console MPG said 20.7 and 21.7 (reset each time). I filled the tank all the way up. Has anybody else noticed a discrepancy between MPG on the console and actual. Pretty good mileage for city/hwy mix. Imagine broken in and all hwy could do close to MPG. Besides with XM, some ocassional horsing around it has been great, even at $2.85/gallon.

  • Get it this week :D

    I'm totally jazzed. I'll give detailed report here when I get it. Hell, I've wasted enough time on this forum when I should be making money instead :confuse:

    I'm impressed by your mpg. I'm interested in what will happen when the car has 10,000 miles and is broken in -- and the weather is warmer (at least for least the snow is melting here).
  • Oh, yeah, I'll be checking the mpg too. I want to see if the car computer is accurate... :blush:
  • The last MPG had the AC on, it has been 80s-90s the last week. So AC really didn't change the MPG too much.

    Enjoy the new car
  • So what are you averaging for mpg...?

    (still haven't gotten the car...waiting...waiting...)
  • Let's see, only three tanks, I have been traveling and not much time driving it. First tank 21.7 (my calculation) (20.3) by the computer, mix city/hwy. Got 23 (my calc) 22.3 computer mix city/hwy. Got 18.8 my calc, computer 17.9 strictly city. Mostly running either mid grade 89 or super 93. Hope you get it soon. I got flagged down at Sam's Club the other day by a couple asking and looking at the car. We spent about 20 minutes talking about.

    You will love it.

    Bubbaman (Gary)
  • Thanks Gary. Yes, I am still waiting..... :(
    The car has been built and it's in transit. The salesman wasn't lying when he said six to eight weeks. It's officially six weeks as of today and the car should be at the dealer either tomorrow or Monday. I was kind of hoping it would have been four weeks of course.

    That's pretty good mpg. I can never get a good sense of what real world mpg will be by reading car mags...They of course hammer on a test car, and the faster the car the more they seem to hammer it. I'm realllly hoping the car is in tomorrow..

    As to seats: Leather seats in gxp come in suede inserts, but you CAN buy a gxp with cloth seats. it's a 1000 bucks less, but they're rare.
  • One additional positive Benefit I got with the new GXP was lower insurance rates. Go figure. I have Allstate and my 2003 Civic SI was about $100 every six months more. I asked why and my agent said more safety features.

    Anyway hope you get your car soon. I have had mine about 4 weeks, only have 504 miles on it, MPG should get better as it gets broken in.

    Agree with the seats comment. When I was looking for a GXP almost all of them came fully loaded minus the Nav system. I had a hard time finding any without the sunroof/CD system.

    Wish I could get the tunes without the sunroof and wish the Monsoon would play a MP3 CD, tried with no luck.

    Bubbaman (Gary)
  • Nice to hear about your insurance rates. I looked into what it would cost to insure a GXP before I ordered it. The rates are good. Less than small cars, for sure. Heck, the GXP is even quite a bit less than a Prius. I had my agent run down the costs of a bunch of cars just to waste her time....

    Insurance companies only care about one thing: payout rates. Big cars are safer than small cars, no doubt about it. I used to pay more for insurance for an old Ford Escort than I did for a new Suburban.
  • rmozolrmozol Posts: 124
    I finally surpassed the 500 mile mark, and took it on the road after fill up. I was doing a good amount of WOT passing, not to mention LONG road jams, and stopping, due to construction. I still averaged 20.3 MPG, 20.5 by my calculations. I was pretty impressed considering the horrible conditions I was in. I NEVER was even able to use the cruise either. Also, where does your temp gauge needle sit? Mine actually creeped up a little, AFTER I turned the AC off, and got near a lake where it was a lot cooler. The needle sat past the center mark. I'll keep an eye on it from now on.
  • Robert,
    It was 102 and 100 last monday and tuesday in Fort Worth and the temp gauge was mostly at the middle. Mind you I didn't sit in a lot of traffic, but it didn't seem to creep. I have about 800 miles on mine and have seen my last two tankfuls city/hwy mix around 22.5 to 23.2 MPG (my calc and the computer). I think I have seen a slight jump after 500 miles or so. It is hot early here and will last a long time (Oct) so will let you know if I see temperature creep.

    Loving my GXP in Texas,

  • mcp6530mcp6530 Posts: 11
    I don't know how you guys do it! Highway driving, several trips of 350 miles and i average 21 or 22 mpg...granted i'm doing 80 to 90 the entire way. Then city driving, i'm lucky if i clear 18...I sure miss my supercharged bonne ssei! no, not really.
  • When I drive all city 17-18 is the norm. Even a little highway time helps, but around town, traffic isn't bad but I only go 65 or so, 80-90 will really hurt mileage. A lot of times in the morning and evening commute I am either not awake enough or still thinking about the day in the evening, so I use the cruise at 65. It's the errands on weekends that I really get to have fun with the GXP and V-8 power and my MPG suffers, I have had a 16.5 and 17.2 MPG tankful. That said just slepping into work is still great with the comfortable seats and XM radio. I love the GXP even if I don't use all the V-8 power all the time. Do you run premium gas? I have been comparing and maybe it is my imagination, but I think I get a couple MPG better with premium, only time will tell.
  • I've had a chance to do some longer driving in the GXP. AWESOME CAR! Today I cruised just a little below 60 through metro highway traffic. The traffic was weekend, and I was in in no hurry, but I did have to ease up occasionally. The mpg for the 25 mile trip was 28 accordign to the computer. THAT ROCKS! I can get ABOVE 30 if I really baby it. Normal driving (LOTS of stop and go city and, of course, LOTS of letting friends test drive the car) nets me about 19 mpg. And my friends ALL want to drive this car. That really drives the mpg down. :cry: I'm driving it like a granny. My chums love the acceleration. Best car I've ever owned, by far. Quality has been terrific. Fit and finish are flawless. Brakes are stunning. Hit them and the car just....stops. I can't get the car much though because my wife drives it all the time... :(
  • bob97bob97 Posts: 16
    Everyone seems to be doing a lot better then I am with mileage. My 2006 GXP with a little over 5k miles is only giving me 14 to 15 MPG driving around town – premium gas only and without a heavy foot! I am almost tempted to complain to the dealer about my low MPG, but I cannot image what would cause one car to be off so much (it runs great in every other respect). I am constantly driving up and down low gradients, but I’d expect the downs to average out the ups.

    Is anyone else falling short of the MPG numbers being posted here?
  • blckthreeblckthree Posts: 153
    Your mileage is the same as mine. I don't run 90, but just over 80 and I will get 20-22mpg. City driving, without any highway driving, lots of traffic lights and stop and go traffic, I get more like 13-14.

    On a daily commute to work, I keep it around 70mph, and get about 24mpg. The mileage is acceptable to me, but I wish they wouldn't have put that sticker on that said you could get 28. I'll never see that.

    All this is with 87 octane fuel.

  • chats1chats1 Posts: 158
    I have a 2006 GXP. When I first got the car I was getting about 13-14 and a little upset because of what GM said we would get. Now, I have 10,000 miles on my car and the highest I have gotten is 26.5; the lowest 19 around town. I drive mostly on highways. I use only Amoco Ultimate as I did with my three previous GTP's. I am satisfied with my mileage. As far as the gas prices go, there is absolutely nothing you can do about it, so I don't even complain. I'm just worried about gas lines and not being able to get gas. I knew when I purchased this car that I would use more gas and my mileage would be less than on my GTP's but I didn't care. If I was to worry about gas, I would have bought a Toyota which didn't interest me at all. I am very pleased with this car and its performance. My brother was complaining about the gas, I told him to use a bike!! I think that the more mileage you put on the car, the better the gas mileage. That's how it has worked with my car.
  • Me too! I'm getting a whopping 14.3 MPG city, recently up from 12.1. My gxp has 2500 miles on it and fuel economy in town has been 12.1-12.4 up to the last tankful of 87. I guess it finally broke in. also it used a quart of oil by the time it had 1900 on it. My wife and I really adore the power and handling though, and I'm pleasantly surprised by the number of compliments we have recieved on it's styling and color(dark cherry).We're panning a trip to springfeild soon, can't wait to see some hiway numbers.
  • Took my 05 GXP on a road trip to vegas this weekend. 600 mile round trip. 11,500 miles on the car. Going i got 23.5 mpg. averaged about 70. coming home i got 23.9 mpg. averaged 70-80. Guess the mileage isnt going to improve. Miss my 2000 sls..same engine...would get 28! Those low profile tires suck. they ride hard and follow every crack in the road. Does anyone know if i can put a tire on the car with more rubber without the tire rubbing since the clearances are tight??
  • rmozolrmozol Posts: 124
    I thought that this engine was new in 2005? I know they made some iron-block 5.3 Vortec, but the all-aluminum was new I thought. 24 MPG isn't that bad either in that altitude. If you mean a wider tire, I doubt there's much more room. If you mean taller, with more sidewall to absorb the cracks, we might be out of luck too. You'd have to go to a thinner tire, with a higher aspect ratio; like a 235/60 x 18? Then the traction would stink since it would be narrower!
  • rayainswrayainsw Posts: 3,007
    "I thought that this engine was new in 2005?"

    The DoD version of the 5.3L V8 was new in 2005.
    I believe that " erichthecatt" is referring to the Bonneville GXP w/North*.
    - Ray
    Looking forward to driving 600+ miles this coming (long) weekend.
    At many (s)miles per gallon . .
    2016 BMW 340i
  • Thanks Ray. I should have stated Bonneville. I was thinking of a taller tire. While i was sitting at a casino in vegas trying to win an 06 chrysler 300 for 15 cents, i noticed that the car had goodyear 225/60/18. It looked like quite a bit more rubber height. Does anyone know where i can go to compare the two tires? I dont want to mess up the speedo
  • rmozolrmozol Posts: 124
    I did some checking on Tire Rack's site, and found the difference. Some 225/60 x 18 are the same diameter as the stock fronts, and others are about 1.5" inches taller; it strictly depends upon brand. This would equate to about a 6% difference for a wide spread between the two. That would mean it would read 100 MPH, when it's really going 106 MPH. Not that bad at all.
  • bxdbxd Posts: 186
    If you want to soften up the ride, don't mess with the size of the tires. Pick a tire that is aimed at a quieter/softer ride instead of one that is fairly skewed towards performance. For example, for the front, Continental ContiProContact in original size are only $126 at the Tire Rack and rate very quiet, and nice riding, while not totally giving up handling. Or some Pirelli PZero Nero M&S but those are a lot more money.
  • gxpjoeypgxpjoeyp Posts: 38
    Im trying the freeway thing on my current tankful of gas,so far its around 22.3 on 80/20 freeway/city is anybody else watching there mpg and if so can you tell me what your getting? I know the epa says 28/17 which i understand is just an estimate with all the factors involved,but if i could avg 24 i will be satisfied.
    2006 gxp
    1513 miles and loving it!!!
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