95 or older, 4.0L… short bed std cab.
Also, I do not think that there is a Ranger other than a 4 cyl that will give you more than an honest 18 mpg.
Rangers are not good on gas.
I did drive a 95, 2WD, 2.3L, 4 cyl, 5-sp… yes I got 24 at times but not always, around town less.
My 3.0L, 5-sp, 4WD is lucky to get 16, even on the Hy-way.