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MPG decreasing

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Old Aug 28, 2007, 01:04 PM
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MPG decreasing

Recently I have noticed reduced fuel mileage. I was around 300 a tank, and now its become more like 220. The only two significant changes in the past few weeks is an oil change, with Mobile 1 10w30 and an oem filter. And the weather has been dropping in the evening, around 50's and 60's. I am curious if its the oil change because the last time the weather was cooler I was still keeping good gas mileage??
Old Aug 28, 2007, 01:24 PM
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It's probably your way of driving. Has traffic increased in your area which would cause you to stop and go more often?
Old Aug 28, 2007, 01:25 PM
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maybe its time for plugs and an air filter change/cleaning
Old Aug 28, 2007, 01:26 PM
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change air filter and increase tire pressure
Old Aug 28, 2007, 01:33 PM
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How many miles on the car? Check primary O2... that is a significant drop.
Old Aug 28, 2007, 01:34 PM
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check your tire pressure. when is the last time you changed out your spark plugs?
Old Aug 28, 2007, 01:36 PM
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I installed the apexi intake about 5k ago but havent cleaned it since...and the driving style has been the same. when i did the oil change i checked my tires, and aired them very close to the manufacture psi. i just rolled 29k on my odometer, so could it be that time for plugs?? Also it seemed like it was an abrupt change in mpg, which is why i questions the oil change.

Last edited by jeffbum; Aug 28, 2007 at 01:39 PM. Reason: forgot something
Old Sep 5, 2007, 12:08 PM
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its all in your foot
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