HHR SS Topics and information on the 2008-2010 Chevy HHR SS Turbocharged models.

What's your highway gas mileage ?

Old 04-16-2019, 03:23 AM
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What's your highway gas mileage ?

I would like to compare other SS's to mine. I just did a 120 mile trip without my tune on and got 18.3 mpg, which I knew average speed for that mpg.
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Old 04-16-2019, 05:34 AM
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Couple weeks ago I did 2 trips on 2 consecutive days. Each was the same 200 miler on the interstate at 70-72 mph. Both times I reset the DIC and saw 31.4 mpg when I returned home. Filled up the car after the 2nd and it showed the same mileage via pencil/paper so the DIC reading was spot on.
Snapped this after the 1st trip:

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Old 04-16-2019, 05:38 AM
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George how many miles on your SS ? That gas mileage almost equals an LS.
When I did my trip I did 70-75, but then would hit stop and go on the road.
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Old 04-16-2019, 06:04 AM
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I have 55k miles on my SS.
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Old 04-16-2019, 06:27 AM
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Originally Posted by firemangeorge View Post
I have 55k miles on my SS.
OK same as mine.
I wonder how the ECM computes mpg.
I usually drive more around town than highway and this possibly might affect mpg readings. Maybe I can find something on this.
I know your mpg can drop if the engine idles quite a bit.
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Old 04-16-2019, 06:43 AM
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I don't have an SS but one thing I noticed that seems to get left out of the "equation" when guys compare MPG is the weight of their wheel and tire configuration. These cars seem to react dramatically to a lighter weight set vs a heavier set. (same outside diameter/width/etc.)

Which makes sense, but I've never had a car where the difference was so dramatic as my HHR.
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Old 04-16-2019, 06:53 AM
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I do have aftermarket wheels on mine but don't know the weight. But it's a far cry between 31 vs 18 when comparing Georges car (with OEM wheels) to mine, when both of us have 55K.
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Old 04-16-2019, 07:00 AM
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I've been logging my gas purchases and figuring my tank mileage since I got my car new in 2010. Have never been below 25 mpg per tank since the beginning.
One thing different is my road conditions. I live in a rural area but it's all paved roads with most speed limits around 45-55 posted and stop signs and red lights pretty far apart. Those conditions make for some optimal mileage.
I very rarely do any of that "city" driving.
Also noted. My mileage per tank increased when I got the GMTU installed several years ago. (as long as I keep my foot out of it )
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Old 04-16-2019, 07:09 AM
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Originally Posted by firemangeorge View Post
I've been logging my gas purchases and figuring my tank mileage since I got my car new in 2010. Have never been below 25 mpg per tank since the beginning.
One thing different is my road conditions. I live in a rural area but it's all paved roads with most speed limits around 45-55 posted and stop signs and red lights pretty far apart. Those conditions make for some optimal mileage.
I very rarely do any of that "city" driving.
Also noted. My mileage per tank increased when I got the GMTU installed several years ago. (as long as I keep my foot out of it )
OK there are two differences I see.
You don't do short runs and the GM tune upgrade was a plus.
If I turn on my Trifecta tune mileage doesn't increase.
I know the ECM learns your driving habits. In your case your mostly "highway" and it has taken that into account for possible better mpg ?
George do you reset your mpg on the DIC everytime you fill up ?
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Old 04-16-2019, 07:11 AM
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18mpg is a horrible number. I average 27-30 with 90-10% hwy city driving. 2010 ss with 125k miles.
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