Additionally , the ACO , the governing body of Le Mans , has put a number of restrictions on the diesel engine .
The R - 18 Quattro Hybrid is at a disadvantage when it comes to fuel efficiency .
Additionally , the ACO , the governing body of Le Mans , has put a number of restrictions on the diesel engine , so that the R - 18 Quattro Hybrid is at a disadvantage when it comes to fuel efficiency .