Originally posted by: CurseTheSky
If you're looking for something more fuel efficient, grab a smaller, lighter, 4 cylinder car like a Focus, Civic, Corolla, Sentra, etc. Look at the local listings (such as on Craigslist) and check out some of the cars you find. Grab the one with the lowest mileage and the fewest iffy parts you can find. Stay away from anything that's been modded (exhaust, CAI, etc.), has mis-matched panels, or comes with a bunch of decals all over it.
If the fuel economy of the van isn't really killing you, I'd just keep it for now. Save up some money and grab a newer, safer, nicer car. If you're looking for something more fuel efficient in the future, stay away from vans, trucks, SUVs, jeeps, etc.
If you're looking for something relatively cheap to have fun in, a mid to late 90s Mustang, Camaro, or Firebird isn't a bad way to go. Make sure to get a V8 manual, and definitely get an insurance quote first.