Why is ethanol gasoline less fuel-efficient?

[DeMaddox]

According to reports from CCTV News, ethanol gasoline has similar fuel consumption compared to regular gasoline. Additional information: 1. Introduction: Ethanol gasoline refers to the addition of a small amount of biofuel ethanol to regular unleaded gasoline. If you see a capital letter 'E' before the gasoline grade at a gas station, it indicates ethanol gasoline. According to China's national standards, ethanol gasoline is blended with 90% regular gasoline and 10% fuel ethanol. 2. Benefits: Promoting the use of ethanol gasoline helps reduce PM2.5 pollutant emissions and protects the environment. According to the 'China Motor Vehicle Environmental Management Annual Report (2018)' released by the Ministry of Ecology and Environment, China has been the world's largest producer and seller of motor vehicles for nine consecutive years. Vehicle pollution has become a major source of air pollution in China and an important cause of environmental air pollution, making the urgency of vehicle pollution prevention increasingly prominent. Currently, China has a high dependence on foreign crude oil. Promoting ethanol gasoline will relatively reduce energy dependence on foreign sources, which can further ensure China's energy security to some extent.