2000 Forester 5MT/EJ251: ~25 mpg at interstate speeds, 27-28 mpg at 2-lane speeds. Owned from 2009-2020.the suburu in question (late 1970's) I referenced got high 20's....at least mine did before the rear seat floor rotted completely out and seat started err....getting close to the highway.....they were FWD with part time rear
The first gen outback style awd wagon dropped to low 20's
10-20% drop in efficiency isnt trivial on a daily driver just between PT 4WD and AWD option
2014 Ouback CVT/FB25: ~28 mpg at interstate speeds, 30-34 mpg at 2-lane speeds. Owned from 2014-2023.
The 5MT/viscous coupling center diff Forester was by far the more fun of the two to drive, despite having leaky head gaskets and other issues. The FB was a better engine on paper and more efficient, but had very little "fun to drive" in it. It was better off-road than the Forester though.