But automakers argue such an increase could damage engines, fuel lines and emission controls. And makers of small engines say the increased alcohol could adversely affect the smooth operation of everything from lawnmowers and chains saws to boats and motorcycles.
Ethanol producers argue studies show the increase would not be harmful to cars. They say lifting the cap would spur demand and help an industry reeling in bad economic times. The EPA said it is reviewing the request and "will act based on the best available science."