Two Canadian universities duked it out for the second consecutive year to decide who would win the 2015 Shell Eco-marathon Americas grand prize.

The University of Toronto's Supermileage Team 2 snuck past their rival, Laval University of Quebec, in the last efficiency run of the day to achieve the equivalent of 3,421 mpg in the gasoline category of the Prototype class, according to Shell.

Last year, Quebec's Laval team took the crown on the final day in Houston and it seemed like the university was set to take its sixth overall victory after posting 3,365 mpg, the top run until the final run of the day.

Indiana's Mater Dei High School came in third at this year's 30th anniversary event, which took place in Detroit for the first time ever.

The Shell Eco-marathon Americas is a yearly competitive energy-efficient student mileage challenge that draws teams from high schools and universities across Brazil, Canada, Guatemala, Mexico and the United States.

Overall, 51 vehicles were entered by high schools for the 2015 event and 62 were fieldedby universities.

Some teams had problems passing technical and safety inspections. Of the 113 teams that entered, only 89 passed inspection, according to Shell.

Teams could enter vehicles by using either compressed natural gas, diesel, electric battery, gas-to-liquids fuel or hydrogen power.

Awards were also given out for safety, communications, vehicle design, technical innovation and more.

Shell has already announced that the event will return to Detroit next year.

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