I'm considering buying a used 2008 3500 extended mega roof. One of the big motivating factors is fuel mileage over my current truck. I've done a ton of searching on MPG and have not really found anything specific. Best guess is comparing to what some of the RV conversions are posting. Is 17-18 mpg a reasonable expectation for the 3500 ext. mega roof with a moderate load at freeway speeds?
Thanks
Thanks