My pleasure. In all honesty mileage is effected by so many variables, my suggestion is always the same... If you want to play with big trucks then make sure you bring BIG BUCKS!...
Seriously though... What kind of mileage do you get and how heavy are you? I see you have a 2005 Columbia, is your engine maximum engine RPM 2100 or 1800 at no load speed? How many over drive gears in your transmission? What is your RPM at cruising speed? What is your cruising speed? How much idling do you do?
I know; I know; too many questions... I just like to help...
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