First off, yeah we've got a bigger than needed fleet, but one of my hobbies is racing cars on the weekend... Got my eye on a 60mpg motorcycle, but really don't have anywhere reasonable to park it plus the upfront cost have kept me from buying so far.
1991 Toyota MR2 (261,000 miles now) = 32mpg in town, 34mpg normal on highway. If I can find trucks to follow it jumps up to 38mpg.
1995 Mitsubishi Eclipse (123,000 miles) = 25mpg in town, 28mpg on the highway. When I bought it, it actually got 30mpg all around due to an aftermarket fuel computer/air sensor setup. However, that setup made it have all kinds of idling and startup problems, so I switched it back to stock and gave up the mpg. Following trucks seems to have no impact on its gas mileage (it's a big heavy AWD, but very aerodynamic, pig of a car).
Wife's 2002 Toyota Celica (somewhere in the 14x,000 mile range) = 28mpg when she drives it to work (similar conditions I drive everyday in my MR2). When we go on long trips and I drive it, it gets a solid 42mpg.