Like Post#4 said, the only valid measure is hand calculation. the fuel level gauge is only a relative suggestion. They vary all over the map
. "Lie-o-Meters" (aka electronic politicians) are little better.
If you read the stickies, you'd see I view anything less than a 1500 mile sample (which averages out difference in how you fill one tank to the next) as questionable.
All that said, your bigger than average tires have a detrimental effect on MPG
. Did you recal you speedometer when you put the bigger tires on the truck?
These trucks are notorious for draggy brakes. Minimum 2 MPG
loss. I've accidentally burnt up a couple of rotors and who knows how much fuel got wasted.
is also notorious for failing closed and the thing will hiss and its like running with an engine brake on. No matter how much I cleaned it, it would hiss at me from September to mid-May. I electrically disconnected mine and live with the long engine warm-up in the winter.
The combo of big tires, draggy brakes, and stuck EBPV
is easily robbing you of 5 MPG
- maybe as much as 8 MPG
, these trucks are a bitch if you run them out of fuel. Ask me how I know. I have the 26 gallon tank and get good MPG
, but if I pass 400 miles, I'm looking for fuel at any price. Aircraft people call that "tankering" but better hauling around a lot of fuel than running her out of fuel. Besides, empty space in the tank invites condensation in the tank - especially when temperature are crossing freezing.