President Donald Trump signed on in May to a policy change that would lift the ban on selling E15 fuel during the summer. The change is part of the administration’s new biofuel policy.

Previously, the U.S. Environmental Protection Agency prohibited the sale of the fuel, which is 15 percent ethanol by volume, in many areas of the country during the months when temperatures are highest.

The prohibition is related to the Reid Vapor Pressure, which measures how quickly fuel evaporates. The regulatory concern is that fuel evaporation contributes to air pollution. Congress granted a waiver for E10 fuel from the RVP standard in 1990.

The ethanol industry has been pressing the EPA to grant E15 a similar waiver.

When it comes to E15 and motorcycles, the AMA is concerned that allowing year-round sales will make two problems worse.

First, fuel without any ethanol content (E0) has been crowded nearly out of the market by the proliferation of E10. Many older motorcycles cannot run on fuel that contains any ethanol.

Second, increased availability of higher-ethanol blends raises the risk that riders will inadvertently fuel their motorcycles or ATVs with a blend not approved by the EPA for use in those vehicles.

How likely is that to happen?

Studies show that most of drivers shop for fuel by price. And higher blends of ethanol are less expensive than E10 or E0. But none of the estimated 22 million motorcycles and ATVs in the United States is certified by the EPA to use blends containing more than 10 percent ethanol.

And if your fuel system and engine are not designed to use E15, damage may result and your warranty may be voided.