fiction!! mythbusters tested this theory, and it actually turns out that lowering your tailgate while driving decreases gas mileage, because with the tailgate closed,it creates a vortex that air runs right over, with it open,it somehow causes drag!! it was actually a pretty cool test.
Definite fiction.Lowering your tailgate while you drive will improve your MPG?
Fact or fiction?
+1The net effect of camper shell is negative between added weight (negative) and possibly better aerodynamic (positive).
My truck is an '07 auto 4x4 Sport TRD access cab with a net tailgate and I check my gas mileage after every fillup and never get less than 20mpg or more than 21mpg unless I've been towing my 3500# motorboat. Most of my driving is not highway OR city driving and instead is mostly rural driving at speeds between 30 and 60 mph.You got >20mpg with a DC V6 manual 4x4? Is that highway only?