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My car's averae MPG has gone down from 30 mpg to 21 mpg on highway, same commute

My car's averae MPG has gone down from 30 mpg to 21 mpg on highway, same commute

 
Old 01-22-2008, 04:08 PM
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Default My car's averae MPG has gone down from 30 mpg to 21 mpg on highway, same commute

it's a volvo s40 1.9t

my style of driving has not changed.

I've already checked the tires, the spark plugs, the air filter. I was going to check to see if the fuel filter's bad, but I would suspect that a bad fuel filter would allow LESS gas into the engine, not more.

What are other things I should check, or is this something that I have to let the dealer figure out?
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Old 01-22-2008, 04:10 PM
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bad o2 sensor?
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Old 01-22-2008, 04:11 PM
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I just had a new O2 sensor installed 6 months ago. There's no check engine light on now though.
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Old 01-22-2008, 04:12 PM
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how many miles on the car?
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Old 01-22-2008, 04:13 PM
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224,000
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Old 01-22-2008, 04:13 PM
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location? some places have poor performing winter gas
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Old 01-22-2008, 04:15 PM
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air filter?
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Old 01-22-2008, 04:17 PM
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it became an audi?
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Old 01-22-2008, 04:17 PM
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is the turbo still giving boost?
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Old 01-22-2008, 04:17 PM
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I assume you checked the obvious: body in trunk, coke inside door panels..,
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