A trio of 2014 Audi diesel models logged mileage figures that obliterated their EPA estimates during a two-day, coast-to-coast road trip last weekend. A group of hypermilers set out to prove just how far they could go on as little fuel as possible. The most impressive performance came courtesy of the new Audi A6 TDI sedan, which completed the journey with a combined fuel-economy figure that was 50% better than its corresponding EPA rating.
The A6 drove at an average speed of 62.44 mph and consumed a total of only 66.08 gallons of fuel for a recorded 43.56 mpg — 15% better than the EPA highway-mileage rating and 50% better than its combined rating (the EPA lists it at 24/38/29 mpg city/highway/combined). The A7 TDI sedan, whose EPA estimates mirror those of the A6, logged mileage of 42.65 at an average speed of 62.17 mph — 12% better than its highway rating and 47% better than the combined figure. Meanwhile, the Q5 TDI compact crossover, serving in the challenge as a support vehicle carrying luggage and supplies, still managed 38.62 mpg at an average speed of 61.9 mph, 24.5% better than its EPA highway rating and 43% better than its combined rating (24/31/27 mpg).