Question about 2002 Ford F250 Super Duty SuperCab

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In last week mpg went down 4 and car runs fine. Has new air filter, oil change. about 45000 miles. does not make any un usual sounds has good accel and no leaks etc.

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Too much A/C will reduce mpg by 2-3 miles. Nitrogen is now available for your tires. This lasts 3 times as long as regular air. You'll have to check around to find out what shops have it.

Posted on Aug 04, 2008

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It's also possible that when the air filter was changed, too much of the filter treatment (spray) was used. If this is the case, it will line itself out in a couple of tanks or so.

Posted on Aug 04, 2008

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Your two biggest contributors to gas mileage, good or bad, when it comes to the engine and electronics, are the mass airflow sensor and the primary oxygen sensor (the one before the catalytic converter on a 96 or newer car). Since it's running smoothly, I would not expect it to be spark plugs, wires, or distributor related. I would look into changing the O2 sensor if that hasn't been done. Those are wearable items that are usually due for replacement every 60k miles or so, but with 45k, if you do most of your driving in town, yours could be getting too carbon-covered to read properly.

As a sidenote, make sure your tires are inflated to about 34-36psi (I'd go more for 36) - being low on air in one or more tires will create a lot of additional drag and can significantly affect your mileage.

Posted on Jul 26, 2008

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