Recent loss of fuel mileage

[hildyjill]

I have a '99 F350 7.3 diesel. I went from getting 400-430 miles per tank of fuel to less than 300. Is there anything I should look for, EGR valve, etc? This happened all of a sudden. Found no leaks and not driving (towing) differently, no recent changes.

[hondaracer315]

Hey I just lost some milage in my truck too but I think it really is the winter blend fuel that was replaced up here in the northeast. Cuz around this time of year I go down in fuel milage but not that drastic around probably 1 mpg less.

Chris

[wiyrs]

same here, but about 330 MPH a tank on a LB.

i'd check the brakes, ball joints, steering, wheel bearing, filters stuff like that it all has a role in MPG

[Dietoremain]

you dont have egr.

[johndhi]

make sure your tank is full i can put 4 more gallons in after it shuts off

[coot1]

My mileage dropped a couple of miles per gallon also. Also seems a little down on power when towing. I was thinking it might be the fuel.

[dannanw]

winter blend fuel, I get 16ish summer and 12-13ish winter. cause of the anti-gel stuff is what I have been told anyhow. Also try a "can" of cetain er how ever it is spelled to help make sure stuff is clean.