over night gas mileage went from great to terrible why

David Lind

Asked by Sep 06, 2015 at 09:13 AM about the 2006 Chevrolet Cobalt LS

Question type: Maintenance & Repair

We have a 2006 chevy cobalt. It was getting great gas mileage then almost
over night it started burning gas. A 1/4 in 30 miles. Have checked for leaks and
there isn't any and no gas smell coming from anywhere?  What could be wrong

3 Answers


Check air filter and clean throttle body replace fuel filter if have not done so in a while add Lucas Fuel Injector Cleaner to gas tank.


When was the last time your engine was serviced? Have you kept up on your maintenance according to the schedule in the owner's manual?


While firebird's maintenance tips are all important, none of those items cause significant excess fuel consumption, and any performance issues they cause happen gradually, not overnight. Have the trouble codes read. Something has failed or malfunctioned suddenly to cause a sudden increase in fuel consumption. There will be information stored on your car's computer which will tell you where the problem lies.

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