Put some more specs up of your truck, im thinkin of converting to DRW,
Pics woudnt hurt either!
Your upgrades seem pretty vague from what ya say. what kind of chip do you run? superchips, dp, Tony Wildman, Edge, Bullydog, there is a HUGE difference between off the shelf tuners and a custom one. After having both ill NEVER go back to outa the box tuners.
Is it the DIY intake with the napa 6637 filter?
Since you have a chip I sure hope you put gauges on it, w/o em its a disaster waitin to happen.
Your fuel economy is going to be in the tank cuz of the lift/tires. I have a small lift 4" with that same size of tires, the best i can get is around 15-16.
That must be a HUGE gap in the fenderwells w/ an 8" and 315's
If your worried that much about fuel mileage ditch the lift and run stocker tires then youll be alot closer to 20 with some good tuning, but with the lift id be greatful to see the middle teens especially with having the two extra tires and rolling resistance.