Close
Car Questions
RepairPal is your advocate for car care advice and guidance

i'm now only getting half the milage I got 6 mos ago out of my tank.

(2002 Chevrolet Cavalier)
in Bellingham, WA on January 28, 2014
Don't know if it's 2.2L or 2.4, 2 yr old O2 sensor on front, 5 speed. I've always got 500km to a full tank, over last 6 months it's dwindled to 250km!
Displaying 1 answers & 3 comments
Popular Answer
on January 28, 2014
Air filter good shape? Had plugs installed? Check engine light on? Smell gas? Running rough? Good power?
of Gillespie's Auto Service on January 28, 2014
An air filter won't impact fuel mileage. Top end power, yes but not mileage.
on January 28, 2014
Oh really? Then why dont you just answer this!?!
Restricted airflow to the engine has no effect on fuel mileage, humm, humm,...
BS! Dont bother trying to explain, i have deleted this anyway!
of Gillespie's Auto Service on January 28, 2014
Whatever. A gasoline engine runs at full power with the throttle open fully, and at any other time the throttle ends up being the greatest restriction to airflow into the engine, not the air filter. The computer through measurement of that air density calculates the required injector pulse width, and then uses the fuel trims to modify it to maintain optimum ratio's. So with today's cars a dirty air filter can actually cause an increase in fuel economy because under a heavy load it will simply make the engine run like you are not at full throttle. Now back in the 70's when we had carbureted cars and a specific study was done in France, that wasn't the case and the dirty air filter did impact the fuel economy then and there. http://www.fueleconomy.gov/feg/pdfs/2013-01-0311_Diesel_AirFilter.pdf That's just one study. There are plenty more.
RepairPal estimates are guaranteed at over 2,000 quality certified locations nationwide. Learn more

Similar Questions

View answers to similar questions from RepairPal's community of auto experts and enthusiasts.
'96 cavalier. I replaced head gasket. now the engine turns over strong but it won't crank. what are some possible iss...
2004 Chev Cavalier. Shift interlock solenoid not working. NO NEW PARTS AVAILABLE. Chevy no longer stocks and no deale...
Didn't find what you were looking for?