In that case, I've never had a good daily driver: 81 Isuzu 4cyl diesel p/u, 85 S-10 Blazer w/ 79 305 & 350 turbo tranny, 94 GMC 1500, and now 03 Jeep TJ. Gas mileage sucked on all of them, but the Jeep is by far the most fun.
Dude, I had the Chevy Luv version of that and got 45mpg with it, can't imagine how you got less than 20 without it leaking fuel on the ground.