"U.S. fuel-economy standards may create an incentive to increase vehicle size."
"The Environmental Protection Agency (EPA) uses a vehicle's footprint, which is the product of its wheelbase and average track width, to determine fuel economy targets for passenger cars and light trucks. The footprint rule states that vehicles with larger footprints have lower fuel economy requirements than those with smaller footprints. "
https://www.sciencedirect.com/science/article/abs/pii/S0301421511008779
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