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(1990 Ford Ranger)
in Anchorage, AK on March 19, 2011
why would my mile decrease as it gets lower.for example i filled my tank up to the full mark an was getting like 13 to 14 miles a gallon until i got to the 3/4 gallon mark and then from 3/4 to just shy of a 1/2 tank mark im getting like 7 to 8 miles a gallon. can a fuel filter that is going bad cause the decrease in mileage.
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on March 20, 2011
Your fuel filter is not a factor.

Your gauge is entirely vague - please remember you cannot rely on your gauge for accuracy in measuring fuel consumption.

The best way to check fuel economy for the everyday driver is to do this:

--Fill your fuel tank at a fueling station and pump of your choice.
--Stop fueling when the pump shuts off the first time.
--Record your odometer mileage
--Drive your vehicle as long as you want, to whatever fuel level you want.
--Return to the same exact fuel station and same exact pump
--Again fill until the pump shuts off the first time
--Record the amount of fuel you just pumped
--Record the amount of miles driven since you last fueled
--Divide the amount of miles driven by the amount of fuel you just pumped.

That's as accurate a fuel economy snapshot as you can really get. I'm thinking that if you get somewhere between 10-13 miles per gallon, assuming it's a 4x4 and you're driving a bunch of short distance trips more than highway driving, that you're doing well.
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