[comptiger5000]

When you say 20 mpg, do you mean 20 mpg highway, or 20 mpg city/highway combined?

If it's 20+ highway, get an older 4.0 Jeep Cherokee (XJ) or Grand Cherokee (93-98 ZJ, 99-04 WJ). They're decently capable in stock form, can be found with stock skid plates and tow hooks, have lots of mods available if desired, and ZJs and XJs are pretty cheap.

With the 4.0 I6 (mostly found with auto trans), 22 - 24 mpg is certainly possible on the highway if you keep your top speed to 60. At 63 mph average, I've seen 21.7 mpg from my Mom's 99 Grand Cherokee 4.0. It'll do better at lower speeds. Around town, however, don't expect great mileage. An XJ will do better around town, as it's about 1000 pounds lighter than a ZJ or a WJ. Highway mileage is similar, however.