You would expect a screamingly quick, near-exotic sports car to turn in poor fuel economy, and the 2011 Audi R8 lives up to the advance billing.
Somewhat strangely, the base V-8-powered, manual-transmission R8 coupe and Spyder convertible get the worst EPA ratings of the lineup. They're tagged at 11/20 mpg. Adding the automated-manual R-tronic transmission option to this engine raises gas mileage to the best of the lineup, at 13/21 mpg.
The R8 V-10 coupe and Spyder aren't far off the V-8 mark, either. The manual earns an EPA rating of 12/19 mpg; with the R-tronic, it's rated at 13/19 mpg.
Audi has teased the concept-car circuit with a V-12 turbodiesel R8, but an actual production run of oil-burner sportscars isn't expected.