I'll be watching the new Audi R18 e-tron quattro closely at the 24 Hours of Le Mans in June.
I wrote quite a bit about the flywheel hybrid system that was originally developed by the Williams F1 team and then licensed to Porsche in 2010 for the 911 GT3R hybrid.
http://www.popularmechanics.com/cars/alternative-fuel/hybrids/porsche-911-gt3r-hybrid-flywheel
In the 911's first 24 hour outing at the 2010 Nurburgring 24 hour, the car led for more than 8 1/2 hours before a problem with the gas engine caused it to retire. During its first races at the the 'Ring, the flywheel 911 was able to run 13 laps per tankful compared to just 11 for the conventional 911 GT3 RSR in the same race. In endurance races on long tracks like the 'Ring or Le Mans, that kind of efficiency is a huge advantage despite the extra mass of the hybrid hardware.
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