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HHR Real World MPG Numbers



  • ray80ray80 Posts: 1,652
    Tire pressure is always a good thing to check after major temp change. With the cold temps milage will still suffer. It will be better when warmth comes back.
  • smogdungsmogdung Posts: 349
    Pumped tires up to 35 from 30....temps this week 5-21 F....2.4 auto...mpg improved to 24. I think the wife is using that remote start thing a lot & letting it idle to warm up before she leaves work...
  • ray80ray80 Posts: 1,652
    One other thing that may help a tad is to not leave defrost on when not needed as A/C compressor is turned on while using it. My milage has been on steady decline since cold weather made an appearance here in northeast
  • smogdungsmogdung Posts: 349
    Back up over 26....big difference between 5-15 degrees & 30-40 degrees. Big difference between when I drive vs the old lady!!
  • ray80ray80 Posts: 1,652
    Good to hear its a little better, those cold days are tough, as it would be if she looks over your shoulder at what you wrote ;)
  • smogdungsmogdung Posts: 349
    Married 36 years (since age 18), suspect she'd forgive me for this one insensitive statement....retirement from Fed = 12.5 more weeks!!!! 31 years VA, 6 years USNAR, 36 married, 27 father, 17 school = 117 years, no wonder I feel old!!!
  • Do this setup really help fuel economy?
  • ray80ray80 Posts: 1,652
    I assume you mean K& N filter. I don't have any personal experiance with them, but I checked their website and see nothing there thats indicates their air filter increases economy (other then a clean filter does better then a dirty one). There is no shortage of claims from people who claim better economy though (perhaps they only check after replacing the dirty one with brand new shiny new one without checking similar MPF (miles per filter)
  • Is there a way to get any better MPG that someone knows of? I just bought my 07 last Saturday, and other than it showing most the time about 23.8 city, and around 31 or so highway, I haven't really had a chance to see what it really gets. I will be taking a 1000 mile trip probably tomorrow, so I WILL find out. I seen on Ebay that there are several things that they say helps out on mpg, like Turbnado, which is just a piece of metal that slips in the air intake hose, supposedly creating a vortex. I put the original Turbinator in my Explorer, and didn't really monitor it. Don't really think that it did much, but not sure. :)
  • ray80ray80 Posts: 1,652
    I have yet to see any for sure magic bean to will ensure great milage (despite claims from here and there). Best thing I know of is driving habits, usual things like no jack rabbit starts, anticipate stops at lights and ease out of throttle early rather then using brakes at last moment, keeping rpms down and no long warm ups at idle on cold winter days. Yours being brand new I would expect it to be a little stiff right now and I would not be surprised if milage goes up on its own for a while as time goes on. Oh and it helps if you don't have 200 lbs of junk in the trunk also (tools of whatever)
  • It's a 07, but was bought off of a lot that got it at auction from Enterprise with 4800 miles. I just took a 80 mile roundtrip journey this morning. It took about almost all the way there to get the DIC to level out at 33.5 mpg. Then on the way back it showed 32.4. I took the average of both ways, filled it up and figured it to be 30.3 mpg. The DIC must be off about 11%. Quite a bit off isn't it? Do you think that Lucas Injector Cleaner would help any?
  • Oh, by the way, how do you get to the air filter?
  • ray80ray80 Posts: 1,652
    At 30.3 you are still beating EPA estimates I think. Its winter here with cold temps and winter fuel and my milage has gone down. What temps have you been driving in? The air cleaner is under that big plastic thing over engine, and I'd have to look again in manual to see how to get to it. (If you don't have the manual, you could register yours at and get to an online version of it). There is already (or should be) some measure of injector cleaner in the fuel you buy so I don't add any.
  • I'm in Michigan, so it's quite cold right now. We're talking about average afternoon temps 9-17 degrees. I notice that someone has been saying that the cold temps will make the mpg go down. Strange, because I'm a private pilot and my plane would always operate more efficiently in the winter because the cold air is more dense than in the summer temps. I have even been told this by my aviation mechanics. Should the DIC be off by as much as 11%,(reading more mpg, than actual mpg). Do you reset the mpg at each fillup, or just always leave it alone, to do it's own thing. Like I said before, it took almost 30-40 miles for it to finally get to where it leveled out.
  • ray80ray80 Posts: 1,652
    I'll bet once temps get above 40 or so you should see better milage, seems to be that way on vehicles I've had anyway. I only use the DIC as a general indicater, not gospel, and if I am trying to save a few pennies it seems to record higher milage. Some like to reset it all the time, but I usually only do every few thousand miles.
  • smogdungsmogdung Posts: 349
    You want to see some people crying about low MPG...go over to the Murano and CX-7 forums!!!! Some of those guys are talking about 12-13 MPG!!! They act proud when they claim 18-19. I think that over a typical year you will ave 25-27 for a 2.4L automatic HHR up 29-31 for a stick 2.2L. That sound about right Ray?
  • bhmr59bhmr59 Posts: 1,601
    You have to remember that you are getting an average MPG reading. This will include "zero" mpg for every second the engine is running but the car isn't moving,like stopped at a red light.

    Also, the average is calculated since the last reset. If you filled the tank and reset the computer and then drove only 20 miles locally before your 80 mile round trip, you will have put on at least 20% your mileage in local driving. I suspect you had some local driving at your destination (if nothing else, just getting back to the highway) since your 33.5 mpg average dropped to 32.4. No car gets it best mpg until the car is fully warmed up. So depending upon how long the car sat and in what temperature, your return trip could have included anywhere from 5 to 10 miles of the car not operating at peak efficiency.

    If you want to get an accurate reading of your average mph, you should not reset the computer at each fill-up. The reading would/should be accurate for that tank of gas, but it does not give you a "real average". There are so many variables; temperature, wind resistance, steady speed vs accelerating and slowing, terrain, etc. And then there is the issue of a "fill-up." Topped off one time vs removing the gas hose once it automatically shuts off. If you've kept record of manual calculations, recompute your mpg based on using 1/2 gallon more and 1/2 gal less. The difference should be noticeable. "Fill-ups" are not always the same. Calculating your mpg over several tanks tends to average (minimize) the several variables.

    Of course, if you're going on a trip and just want to see how you do on the highway, reset the computer when you are getting on the highway and note the mpg when you are exiting the highway.

    The same principles apply to average speed. Many people are amazed to see that they average say, 24.5 mph, while they drive on a 45 mph road to work. They aren't considering slowing and being stopped for stop signs or red lights. Then there is the lower average speed in the time it takes to accelerate back to cruising speed.

    The computer is constantly measuring whenever the engine is running.
  • bhmr59bhmr59 Posts: 1,601
    Are you taking a running average, i.e. averaging each tank's mpg, or a weighted average, i.e. total miles divided by total gallons?

    Weighted average will give you a more accurate result.
  • smogdungsmogdung Posts: 349
    Over long periods of time my DIC MPG readout is quite accurate.
  • Does anyone know what the gas milage savings are on the HHR 2.2L with a K&N air filter?
  • I was getting 29 MPG in my HHR prior to the engine being replaced. I'm now getting 20 MPG
  • smogdungsmogdung Posts: 349
    Which engine and transmission do you have?
  • jerrywimerjerrywimer Posts: 588
    I've read lots of stuff where people claim to notice gains, but most real world stuff I've seen is minimal, or actually even a loss of economy. The reason is fairly simple- while even power boosts from increased airflow are minimal, power boosts *are* the main effect. And it's because the engine gets better airflow. More air in the cylinder means more fuel needs to be added to keep it from being overly lean. That means more power, but also slightly less fuel economy. However, the real world results seem to say it's mostly driver perception, because even dyno runs show such an insignificant change in power output that build variation from one car to the next can vary as much.

    The only really consistent result I've read about (and experienced, but only with a V8 truck- in this case, my father's) is a major increase in engine noise. His pickup got a lot throatier, which I guess is okay if you like growly V8's. I'm not so sure what it'll be like on a four cylinder though.
  • smogdungsmogdung Posts: 349
    Anyone else notice a significant difference in MPG when the air conditioner is running?
  • I am posting on the behalf of my grandpa, who is the extremely proud owner of an Amethyst Metallic '06 HHR LS :shades: . We live in a very hilly terrain, so lots of acceleration and braking. He can average, short trips, about 28.6-29.3 in normal conditions (temps in the mid 70's to mid 80's). On the highway, it's even better, once getting nearly 38 mpg. That tank averaged out to be 34.7 Mpg. It has not once dropped below 26 MPG. He is very pleased with it, he traded in an '05 Silverado Reg. cab with the 4.3 V6, 4 spd. auto, 3.73 gearing, 17" wheels. It averaged anywhere from 18.5-19.5 mpg, only reached 21 mpg once. Needless to say, filling up the 34 gallon tank became a nightmare quick. He traded it for the HHR, and the difference in payment isn't even half of what he is saving in fuel. Very pleased! ;)
  • ray80ray80 Posts: 1,652
    2 weeks of normal driving (not much city stuff at all) 763.7 miles 22.214 gals fuel = 34.3 MPG
    This past week more city driving and a couple pretty warm morning commutes (plus I felt the need to turn A/C on a few times) 446.3 miles (one tank and no low fuel light on yet) 13.696 gals = 32.5 MPG. not to bad.
  • I have the 2006 LS 2.2L automatic. I drive about 1800-2000 miles a week. On the 3 times I've filled up since I bought the car, (more highway, less city miles) I've been averaging about 29-30 mpg, which is WAY higher than I was expecting based on the EPA estimates. It's about the same or better than my mom's 99 Cavalier.
  • About 7-8 months ago our dealership did a reprograming or something to to try to improve the tendancy of our 2.4L automatic 2006 to frequently not fire up the instant the key is turned..(slow ignition), about half the time you would have to let it crank several seconds....or, just instantly turn the key back off & try again...always it fires instantaneously on this second turn????? Anyway, prior to the reprograming...the MPG reading was always close to a manual measure or a little optimistic. But, ever since the reprogram....(about 20 fillups)...the manual calculation (at every fillup) is about 1.5 to 2.5 mpg better than the DIC MPG readout? By the way, the reprogram did not improve the slow ignition problem....actually this was the second attempt to resolve the slow ignition..

    Still love the vehicle though....

    After 20K miles...ave about 26.5 MPG...
  • poncho167poncho167 Posts: 1,178
    The situation that you describe is usually always a fuel related issue. Somewhere the fuel is losing pressure requiring it to repressurize thus easy starts on the second turn.
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