Given that 1 gallon (3.9 l) of gasoline contains about 31,000 kilocalories, and that some cars today might use one gallon to go 26 miles (42 km, the length of a marathon), how many runners would have to ride inside the car before the car could be as energy efficient as running?
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Shell Eco-marathon is a world-wide energy efficiency competition sponsored by Shell. Participants build automotive vehicles to achieve the highest possible fuel efficiency. There are two vehicle classes within Shell Eco-marathon: Prototype and UrbanConcept. There are three energy categories within Shell Eco-marathon: battery-electric, hydrogen fuel cell, and internal combustion engine (gasoline, ethanol, or diesel). Prizes are awarded separately for each vehicle class and energy category. The pinnacle of the competition is the Shell Eco-marathon Drivers' World Championship, where the most energy-efficient UrbanConcept vehicles compete in a race with a limited amount of energy.
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