I'm pondering a VW Jetta TDI. The mileage is most attractive, and I test drove one recently. Great car with nice features, very roomy, and fast. So, those of you who have them, any down sides? This car will require ultra low sulfur diesel, which is quite common these days, so it's cleaner than any other diesel vehicle from the past. Any diesel car will work, but if anybody has VW Jettas, let 'er rip.