I've got a 94 geo metro, 1.0 AT but making the best of it. So far my best trip has been 41.5 mpg, on a 135 mile highway/back road trip. Mods thus far include WAI, front bumper covered, acetone, 2" exhaust, a/c removal, and 45psi tires.
Future plans include rear (and maybe front) skirts, front air dam, side skirts, front and rear belly pans, rear seatectomy, and a few others to be named later.
Driving methodology has changed significantly of late, improving mileage a fair bit. My biggest obstacle to date is my commute. 3 miles at a shot does NOT lend itself to good, or even fair, FE. Recent tanks have been averaging 30mpg. Soon I'll probably starting bicycling to work.