Shell has announced a team from Colorado has won the prototype alternative fuels category at the Shell Eco-Marathon held in Detroit this month using an ethanol-powered vehicle.  The team, from the University of Colorado, Boulder, achieved 841 miles per gallon in its Tatankatoo vehicle using ethanol. The second place winner for the prototype alternative fuels category was Universidade Tecnológica Federal do Paraná with 742 miles per gallon.