For the second year in a row, a student team from Laval University in Canada has won the prototype category of the Shell Eco-Marathon competition in Houston, Texas. Last year the team achieved a mind-blowing 2,757.1 mpg, and this year — even with the addition of an actual street driving challenge — the team still managed to pull off 2,487.5 mpg with their Alerion Supermileage combustion engine powered vehicle (pictured above).