Why is my 06 impala not getting gas mileage that it did before

Asked by Mar 09, 2015 at 12:15 AM about the 2006 Chevrolet Impala LT

Question type: General

Why is my 06 impala not getting as good gas mileage as it was

2 Answers

20

If you haven't done a tune up on it recently oil change filter, plugs etc. That might do it or check your tires for poor tread or also poor inflation that's my best guess

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Dirty sensors, throttle body, egr, pvc, air filter, fuel rail/injectors, aged/plugged catalytic converter, etc., can all impede gas mileage. On the more serious side, mechanical wear on the engine such as gunked lifters, burnt/worn valve seats, worn valve guides, loss of compression from worn piston rings, worn/slack in timing chain affecting timing, valve lash, worn valve springs, worn cam lobes, worn bearings... there's a lot that can affect gas mileage, lol. But keeping the car well tuned and maintained should keep the gas mileage up where it was when new. If a tune-up alone doesn't restore some gas mileage try degunking the engine as well with some Seafoam or equivalent.

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