Audi's A8 shows the diesel difference - USA TODAY
Big luxury cars mean big gas consumption, but that's starting to change -- and Audi's A8 is a good example. A standard Audi A8 L with the supercharged 3. 0-liter V-6 engine is rated at 19/29/22 miles per gallon city/highway/combined. Not bad for such a big car. But tick the diesel box and your big, comfy A8 L could return 24/36/28 mpg. The combined city/highway rating is 27 percent higher than that of the base engine. , through Detroit and over the Detroit River into Ontario, where a combination of highway and country roads kept the A8 at a reasonable speed. The A8 L is a remarkable touring machine, packed with technology and trimmed to an impressive level with wood, leather and faux suede. Front seat or rear seat, there isn't a bad place to sit, especially with the Luxury Package that my $98,575 test car featured. There's massive legroom for backseat passengers thanks to the extended wheelbase, and those backseats are heated, which was useful in chilly Ontario. Source: www.usatoday.com
