You guys ever put your pedal to the floor in these trucks? They are hd trucks but I'm not sure how much abuse they can actually take. I'm averaging 18.5 miles per gallon driving what I would call normal easy driving. When hauling do you guys ever lay on the power? What psi does the waste gauge kick in? I have boosted to about 20 psi, will it boost higher? New truck so taking it easy right now.