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bad fuel mileage!

35K views 34 replies 23 participants last post by  DrivenDaily 
#1 · (Edited)
I have a 09 LTZ with L4 and 6 speed. It has 16k miles on it. 27mpg is the best it has ever gotten. I have driven fast and driven it slow. I drive 50 miles one way to work every day. All 4-lane or interstate. Just wondering if anyone else is getting bad mileage and what you have done to fix it. The dealership told me they haven't heard of any mileage problems, but they will reflash the ECM and see if that will fix it.
 
#34 ·
I realize this thread started some time ago but was wondering if anyone is finding that this issue got worse with time...

I have an 09 LTZ and I'm down to 12-15 mpg. It dropped dramatically this past year. I've gotten a tune-up, I stay on top of the oil changes, I've changed the tires, I've used fuel enhancers but nothing is working. I took it to two auto repair shops and no one had any ideas.

Any ideas on what the problem could be?
 
#35 ·
Is it the 4-cylinder or V6?

Since it's the LTZ does it have the 6-speed trans or 4-speed?
 
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