I have an 01 2500. 5'' exhaust, rv275, fass fuel system, van aaken power box, bhaf Running on a set of 35'' toyo mt. I really only drive to work an back and works just over 2 miles from home. Should i be burning a whole tank in 6 days?? Just fueled up going to check mileage manually, my computer says im getting 21 to 25 mpg i know it aint right. Just changed fuel filter an air filter yesterday.

 

I drive about 15 miles to work, when i dont do any running around i can get a tank to last me about 2 weeks. But if i do my usual running around i can get about 5-6 days. i average about 300-320 miles a tank (I only run my tank down to 1/4) and i average about 16 miles a gallon. But my commute to work and back is all stop and go.

Also, what gears do you have in your truck?

 

Check your fuel mileage:
Miles traveled (from zeroed out trip odometer at last fill-up) divided by fuel used (how much diesel you put into the tank at the next fill-up) = mpg.

My overhead computer gives me about 2 mpg over what I'm actually getting....

 

Not sure what Gears are in it. I just filled up last night. So I'll check it end of week

 

sure someone's not "borrowing" a little fuel from you. sounds like you should be consuming less than 2 gallons in six days.

 

something is definately not right. I travel about 30mi/day and can go about 2 weeks on a tank. There's no way you can burn thru a tank of fuel that fast, it just doesn't sound realistic. Do you have a leak....Or yes, is someone borrowing fuel from you?

 

Locking gas-cap stop an go. once on freeway i Do alot better

 

so that wasn't supposed to read.... i only drive two (2) miles to work?

 

Yea, I'd say someone else is helping to impact your mileage!! You'd have to have fuel dripping to get rid of that much fuel without a thief.