Audi R18 e-tron quattro Gets Efficiency, Aero Boost For 2015

Audi's R18 e-tron quattro endurance racer has been thoroughly revised for the 2015 season, with efficiency being the dominating theme of this year's LM P1 car.

Audi has long been a believer in hybrid race cars, and has won the Le Mans round of the World Endurance Championship since 2012 with its diesel-electric R18 e-tron.

In 2015, the company's racing arm Audi Sport aims to retain the Le Mans crown by employing wide-ranging efficiency and powertrain tweaks.

Key among these is the increased output of the R18's hybrid driveline, which moves the car up a power class to the 4-megajoule category.