Growth Energy, the US’ largest biofuel trade association, released updated data showing that American drivers recently surpassed a massive milestone: 100 billion miles driven on E15 fuel.

The 15% biofuel blend is saving motorists nationwide an average of up to 15 cents per gallon at the pump, Growth Energy said. In some states, amid heightened fuel costs this past summer, drivers saw E15 savings climb as high as 60 cents per gallon.

Despite the widespread use of E15 to power light-duty vehicles, this fuel blend is only available for sale nine months of the year. Regulations prevent it from being sold during the summer without the issuance of an emergency waiver each year from the US Environmental Protection Agency (EPA).

There aren’t very many products on the market today that allow consumers to both save money and lower their carbon emissions at the same time. E15 is one of them. We need a permanent fix to ensure retailers can continue to offer this fuel option and consumers can continue to rely on it to quickly and easily lower their fuel costs and shrink their carbon footprint.

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E15 is a fuel blend made of gasoline and 15% bioethanol. The US Environmental Protection Agency (EPA) has approved its use in all cars, trucks, and sport utility vehicles (SUVs) made in model year 2001 and newer—representing more than 96% of all vehicles on the road today.

E15 can be found at more than 3,400 gas stations in 31 states and is legal for sale in every state except California.