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Energy efficiency standards based on product attributes may interact with market conditions and affect the overall stringency of the standards. In this paper we analyze the interaction between gasoline prices and the redesigned and tightened federal fuel economy standards. Tightened standards tend to reduce the effect of gasoline prices on market shares. Furthermore, under the standards a vehicle’s fuel economy requirement depends on its size. Lower gasoline prices incentivize consumers to purchase new vehicles with lower fuel economy, which are typically larger and therefore face lower fuel economy requirements. Using monthly data from 1996 to 2015, we find that fuel prices have had a smaller effect on market shares in recent years than previously. This result appears to be driven by a stronger response to rising than falling or stable prices. We construct two proxies for the stringency of the standards, and …