Salvo and Huse (2012) found that roughly one-fifth of flexible-fuel (cars that can run on a mix of ethanol and gasoline) car owners choose gasoline when the price of gas is 20% above that of ethanol (in energy-adjusted terms) and, similarly, one-fifth of motorists choose ethanol when ethanol is 20% more expensive than gasoline. What can you say about these people's tastes?