Dude, you will have no problem breaking 40 us mpg once you get a full belly pan setup. You might also try some low viscosity synthetic fluids and some alloy underdrive pulleys. Get one of the lund wiper cowl moldings and then you can have your other wiper back. Check out Silverado30MPG if you need some ideas. I'm hoping to hit 43 us mpg @ 45 mph with my 1/2 ton.