After Reading The Members Power Mode Comments I Decided To Do Some Research. A Prominent Member We All Know E Mailed Me Back And Said He Did Not Think Leaving The Power Mode ON Would Increase The VX Gas Mileage. I Then Called Isuzu Of America And They Told Me It Would Actually Decrease The Gas MPG. Next I Called MERLIN From ST Charles Isuzu And He Strongly Recommended NOT Using The Power Mode Especially For Normal City Local Driving That it Would Definitely LOWER The Gas Mileage. He Said It Is Used For Aggressive Driving. So There You Have It Unfortunately I Cannot Speak From My Experience.