This weekend’s race at Petit Le Mans marks the first time all five fuel and energy sources are racing in the American Le Mans Series in one event. Below is a description of each source, and which teams use which sources.

Highcroft Racing runs E10 ethanol. Photo credit: Rick Dole for Michelin North America

E10: Patron Highcroft Racing HPD (No. 1), Muscle Milk Team CytoSport Porsche (No. 6), Robertson Racing Ford (Nos. 40, 04), Falken Porsche (No. 17), JaguarRSR (Nos. 33, 75), Libra Radical Nissan (No. 5), ACS Express Ford (No. 10), OAK Racing (No. 35), all LMP Challenge (Nos. 36, 52, 55, 73, 89, 95, 99) and GT Challenge cars (Nos. 23, 28, 48, 54, 63, 69, 77, 88).

Drayson Racing's Lola Judd Coupe runs on Cellulosic E85 ethanol. Photo credit: Rick Dole for Michelin North America

Cellulosic E85R: Drayson Racing Lola Judd Coupe (No. 8), Autocon Lola (No. 12), Intersport Lola (No. 37), Corvette Racing Corvette ZR1 (Nos. 3, 4), Flying Lizard Porsche (Nos. 44, 45), Panoz Team (No. 50), Risi Competizione Ferrari (Nos. 61, 62), BMW Rahal Letterman Racing (Nos. 90, 92), Extreme Speed Ferrari (Nos. 01, 02).

Audi runs on clean diesel, GTL (Gas to liquid). Photo credit: Rick Dole for Michelin North America

Shell Gas-to-Liquid (GTL) Clean Diesel: Audi (Nos. 7, 9), Peugeot (Nos. 07, 08).

The Mazda-powered Lola runs on Isobutanol. Photo credit: Rick Dole for Michelin North America

Isobutanol: Dyson Lola Mazda (No. 16)

The Porsche 911 GT3 R Hybrid. Photo credit: Rick Dole for Michelin North America

Hybrid: Porsche 911 GT3 R Hybrid (No. 911)