In this April 5, 2019 photo shows the back of a van that runs on vegetable oil that had competed in the Green Grand Prix at Watkins Glen International in upstate New York's Finger Lakes region. The Green Grand Prix is only one of its kind in the United States sanctioned and insured by the Sports Car Club of America. (AP Photo/John Kekis)

In this April 5, 2019 photo, a driver sits in an all-electric single-seat race car that competed in the Green Grand Prix, a fuel mileage rally for alternate-fuel vehicles and hybrids at Watkins Glen International in Watkins Glen, N.Y. It is the only event of its kind in the United States sanctioned and insured by the Sports Car Club of America and just celebrated its 15th anniversary. (AP Photo/John Kekis)

This April 5, 2019 photo shows a 20-year-old Chevrolet Metro LSI that had been in a flood before a class at SUNY Broome Community College helped transform it into a full electric commuter with four battery packs from a Nissan Leaf and solar cell-covered roof panels. The vehicle averaged the equivalent of 179 miles per gallon to earn the most fuel-efficient vehicle award at the Green Grand Prix, a fuel mileage rally for alternate-fuel vehicles and hybrids conducted at Watkins Glen International in upstate New York's Finger Lakes region. The event is the only event of its kind in the United States sanctioned and insured by the Sports Car Club of America. (AP Photo/John Kekis)