LMP1-H and LMP1-L:
LMP1 is the top class of Le Mans Prototypes and is split into two sub-classes. The LMP1-L is for privateers and tends to be a little lower in technology and performance than the LMP1-H cars. P1-H cars are the preserve of the major motor manufacturers, the H standing for Hybrid.
The eyes of the world are on the P1-H field which currently includes the Porsche 919-Hybrid, the current world champions, the Audi R18 e-Tron Quattro and the Toyota TS050 Hybrid. The class is the proof that there are many answers to the question of speed.
The Porsche is a V4, the Toyota a V8, both are turboed and use petrol. The Audi is a diesel as has been their way for many years. All use energy harvesting to power electric motors making them 4 wheel drive when electrical power is being used.