[Nedward]

Originally Posted by worland

For an old 2V 5.4L, 12 MPG isn't too far from normal if your talking about city or mixed driving.

There are a few things you can do to squeeze another 1-4 MPG from your truck. Keep the RPM's below 2000 while accelerating, coast to stops and into turns, inflate your tires to the max on the side wall, lose the off road tires and big rims, remove unnecessary weight from the cab and bed (tool box), stay under 65 MPH on the highway. With as many miles as you have, I would just replace the MAF (buy OEM). Hook the truck up to a code reader. You may have a code for an 02 sensor or MAF in memory even though the check engine light is not on.

I got my '01 HD from 11mpg to 13 by pretty much doing the above. I have a K/N 77series and I still have the 20" rim/tire combo.

Im looking into getting a tune but if you wisper "tune" and a shouting match over which tuner is best occurs.