For quite some years now, my main mode of transportation has been a 1982 Mercedes-Benz 300SD, a base model-plus-sunroof 3 liter turbo diesel. This represented the budget version of the Mercedes flagship sedan, if you will, but still cost as much as a small house. I am finally moving up to something slightly newer, a 1997 Audi A8 Quattro. Like the Mercedes, when it was new, its price was similar to that of a small home. There are other similarities and differences, and only recently have I had the opportunity to make any kind of comparison.