I understand what you mean
My Explorer weight 4,600 lb. That was weight at Ford's scale it their rule when we enter and out.
Problem with my tires they are highway but it supposed to be thin but mine look like FAT dragster tire. Tire shop say that is Factory size. I believe 235/75/15.
Oh by way my hood on explorer weight nearby 75 or more. Explorer from 1995-2003 have light hood so that could explain how he got 30 mpg due less weight.
I have this annoy tailgate so close to me I could notice vacuum gauge raise about 4 psi it show me I have VERY BAD back drag on rear end. I could got 3 mpg improve if I fix rear door to more efficient in air flow.
I need figure out how to improve this one. That isn't mine. It was from Google's search image since I didn't have picture of rear.