mine is 4,150 LBs two door, and gets 27.5/29 mpg at 60mph max
running 31s at 50 psi on 7x15 alloy rims.
and K\N air filter.

run at 50 or less and it goes to 30mpg+

this is with "no cargo", just a driver and full fuel tank.

("max") about 575 miles on a tank. running on fumes.

86 trooper T\D with rare gen3 rods