Law mandating ethanol use
The size of the crop influences environmental health, the country’s food system and diet and what fuels the nation’s automobiles.This series explores corn’s role in contributing to factory farmed meat and obesity, how little of the crop gets directly eaten by people and how corn got so big in the US.Learn more: Ethanol Fuel Basics Fuel ethanol overview (Table 10.3). The United States’ most important crop, corn, is grown on a massive scale.The energy content of denaturant is about equal to the energy content of pure gasoline. In general, vehicle fuel economy may decrease by about 3% when using E10 relative to gasoline that does not contain fuel ethanol.
Most of the gasoline now sold in the United States contains some ethanol. There are three general categories of ethanol-gasoline blends: E10, E15, and E85. E15 is gasoline with 15% ethanol content, and E85 is a fuel that may contain up to 85% fuel ethanol.The ethanol content of most of the motor gasoline sold in the United States does not exceed 10% by volume.Most motor gasoline with more than 10% fuel ethanol content is sold in the Midwest where most ethanol production capacity is located.To improve combustion in engines, ‘anti-knocking‘ agents have been added to fuel since the 1920s.The first antiknock agent was lead added to gasoline to boost the octane rating, but significant environmental and public health damage led to the phase out of lead additives in the 1970s.