VW Beetle
My daughter has a 2001 VW Beetle, gas engine. It was my wife's car until we got her a Passat in 2004. It's a very cute car, but they're notorious for electrical gremlins. At just over 70k miles, it's eaten 2 power window switches, a power window motor, a blinker relay, and a door handle.
Now, if you shop aftermarket, you can save 33% to 50% off dealer prices, and get the parts faster thru mail order than from the dealership.
The local dealer has been good to us, but the dealership where we bought the Bug, about 20 miles away, was horrific. They sent the car out the door with severely underinflated tires (under 20 lbs, I checked them when we got the car home!), and when they touched up a scratch they did on the front fender, it was the wrong color yellow.
Yes, you can save a lot of money in fuel with the VW TDI. If you can fix PW motors / switches, and do basic maintenance yourself, then it's a car worth considering. If you have to rely on the dealer to check your oil level, you'll definitely want to look elsewhere.
Eddie