Race cars don't really use much in the way of gas. There is FAR less gas consumed by the race cars at a NASCAR or IRL event then the fossil fuels consumed to power the lights at a night baseball game, and I won't even go into the gas consumed by the people driving to the stadium. Do the math - 40 cars at 500 miles = 20,000 miles. At 5 MPG, that's about 4000 gallons. Now, for a stadium that has 20,000 people in it, averaging a 40-mile round trip to the park, that's 800,000 miles. At 20 MPG, that's 40,000 gallons - ten times what is consumed by the racecars. Yup, I wasn't talking about the race cars. It's all the fans, the beer trucks, the concession trucks, the vehicle trailers, the TV crew trucks, the RVs and all the trucks for the stuff that supports the races. Probably closer to 100,000 gallons per race and that's multiplied dozens of times weekend after weekend after weekend for every sporting event out there...