EPA approves sale of a higher-ethanol fuel to try to lower gas prices

This reduces vehicle fuel efficiency and can be damaging to fuel systems not designed to tolerate higher ethanol content.

https://www.consumerreports.org/cars/car-repair-maintenance/...

https://www.eia.gov/tools/faqs/faq.php?id=27&t=10

> The energy content of ethanol is about 33% less than pure gasoline. The impact of fuel ethanol on vehicle fuel economy varies depending on the amount of denaturant that is added to the ethanol. 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.