Photo de stock - Detroit, Michigan - A student from Ruston High School in Louisiana drives an ultra fuel-efficient car her team has built on the streets of downtown Detroit in the Shell Eco-Marathon. The contest challenges students to build fuel-efficient vehicles; the winning entry in the gasoline prototype class posted 3,421 miles per gallon.

Photo de stock: Detroit, Michigan - A student from Ruston High School in Louisiana drives an ultra fuel-efficient car her team has built on the streets of downtown Detroit in.

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