I have a 2.2 auto 45K+ 27.7mpg and I don't drive for mpg

 

My thoughts on this were that MAYBE the car originally had 16" wheels and the dealer (or someone else down the line) swapped them for the 17's and didn't have the BCM recalibrated. To the purchaser, they would appear to be stock because that is what you got from the dealer when you drove it off the lot. I'm not sure if the circumference of the 16's and the 17's are the same though. Just a thought with such a large discrepancy in the mileage.

 

When I first read this post I scratched my head and wondered if that DIC was even remotely close to actual. I did a little calculation of my own with a calculator versus the DIC. On one full tank of regular I got 29.7 according to the DIC. On the calculator I got just over 30. No too bad of a difference I think.

 

I have recently been checking my mileage vs the DIC and it's been damn near dead on. +- 0.2MPG over a tankful.

 

I'd suspect a faulty fuel injector (putting in more fuel than the computer thinks it is). Weren't there a couple of people last year with similar problems that had injectors replaced?

Also, you'll never get the full mileage potential with regular gas on the 2.4.

Yves

 

But you can get pretty damn close. My HHR hasn't seen anything but regular for months now, and the economy is nearly the same. It would not account for the original poster's lousy economy.

 

Stu,
I know that taking the car to the dealer w/o a loaner is a pain, but is it more costly than living with the problems? If you don't find a way to get the car in but continue to complain about it, that just doesn't make much sense to me. Pay for a rental if you have to.

 

People who get all up in arms about this crap crack me up. The fact that you honestly think that the car should get over 30 MPG during the winter running regular fuel, laden with passengers and baggage, going 70 MPH over hilly KY terrain is ridiculous. Try THAT with a Prius and you might pick up 5 MPG over the HHR with a rougher, noisier ride.

I've said it before: If you really hate the car that much, go buy your me-too yuppie Toyota and leave everyone else alone.

 

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Apparently you've managed to trade your chalk for a keyboard.

 

One more thought - are you using the remote start a lot? I would imagine that leaving the car to warm up a lot would reduce your self-calculated MPG.

In the most polite way I can say it - I still can't believe you get better mpg from the Silverado. I'd say keep that truck because it defies all experiences I've had with large vehicles.