2015 Shell Eco-Marathon

Shell Eco-marathon Americas Final Day

The Sting, #305, Battery Electric Prototype, competing for team Cedarville Supermilage - Sting from Cedarville University, Cedarville, OH, United States on the track on the final day of the Shell Eco-marathon Americas 2015 in Detroit, Mich., Sunday, April 12, 2015. (Rex Larsen/AP Images for Shell)

Shell Eco-marathon Americas Final Day

The Black Diesel, #5, Diesel Prototype, competing for team No Spark Plug Allowed from Sullivan High School, Sullivan, IN, United States on the track on the final day of the Shell Eco-marathon Americas 2015 in Detroit, Mich., Sunday, April 12, 2015. (Rex Larsen/AP Images for Shell)

Shell Eco-marathon Americas Final Day

The HUSKIE ROCKET, #9, Gasoline Prototype, competing for team NIU Supermileage from Northern Illinois University, Dekalb, IL, United States, is seen on the track during final day of the Shell Eco-marathon Americas 2015 in Detroit, Mich., Sunday, April 12, 2015. (Bryan Mitchell/AP Images for Shell)

Shell Eco-marathon Americas Final Day

The Tenth Gen, #3, Gasoline Prototype, competing for team Mater Dei Supermileage 2 from Mater Dei High School, Evansville, IN, United States, is seen on the track during final day of the Shell Eco-marathon Americas 2015 in Detroit, Mich., Sunday, April 12, 2015. (Bryan Mitchell/AP Images for Shell)

Shell Eco-marathon Americas Final Day

The JD 4020, #502, Diesel UrbanConcept, competing for team Knights 3 from Alden-Conger High School, Alden, MN, United States, is seen on the track during final day of the Shell Eco-marathon Americas 2015 in Detroit, Mich., Sunday, April 12, 2015. (Bryan Mitchell/AP Images for Shell)

Canadian black Prototype on track

The UT3 gasoline Prototype, competing for team University of Toronto Supermileage from University of Toronto, Toronto, ON, Canada. (Rex Larsen/AP Images for Shell)

Shell Eco-marathon Americas Final Day

The GEN 4, #35, Gasoline Prototype, competing for team Eco Illini from University of Illinois at Urbana-Champaign, Champaign, IL, United States on the track on the final day of the Shell Eco-marathon Americas 2015 in Detroit, Mich., Sunday, April 12, 2015. (Rex Larsen/AP Images for Shell)

Mater Dei UrbanConcept on track

The Elroy -- gasoline UrbanConcept by team Mater Dei Supermileage from Mater Dei High School, Evansville, IN, United States. (Rex Larsen/AP Images for Shell)