Compression Ignition Addict
Join Date: Oct 2007
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Seriously.....you didn't buy a PSD with 8" lift on 38" tires and expect to get good MPGs did you?
If you get 14-15 you're doing good, IMO. Your gauge/MPG is not correct as its not corrected for big tires. You have to adjust. Your adjustment is somewhere in the 15-18% range higher(off the hip here, didn't do math to figure it out for you) than the gauge tells you.
If you're running around town a lot, don't expect much above 12 mpg....its a big, heavy truck, moving it from a stop takes a lot of energy.
if you want to drop another 500+/- bucks get an SCT with some custom tunes and that might help some, but really....if you want better MPG, lower the truck to stock or get a car. I would doubt, despite everyone's praises that you're going to get a lot more MPG out of a tuner- you get more power and a little more MPG...
I'm a wh0re for free stuff