First expensive truck purchase.

[Owen17]

Thanks for the reply. Reason for wanting a peterbilt is that I’ve always liked the way they looked and decided that’s the style I want. I don’t want to sound dumb but what are the reasons a truck of this body style is so much more of a fuel hog than the other road tractors with the same engine? Is it because of aerodynamics? Engine has not been de-mandated. Gear ratios are setup for what I plan to do with the truck.