Jeff Miller is filling up his tank with fuel which contains up to 10 percent ethanol -- E-10, a fuel mix with a corn derivative.
But the EPA just approved the use of E-15, fuel with 15 percent ethanol and already in use in three states.
" I'll read about it and get information first before I put anything in my car like that," Miller said.
Miller is not alone. The EPA says only 5 percent of Americans are familiar with E-15. AAA put out an advisory warning consumers E-15 can be bad news for your car, especially older models.
"The use of E-15 could potentially damage your vehicle and void any warranties associated with the damage of your vehicle as a result of E-15," said Jessica Brady with AAA.
Even members of ABATE, a political advocacy group, wants the EPA to put the brakes on the release of E-15 in Florida until drivers know what effect an increased ethanol mix can have on cars not made to run on E-15.
"Runs hotter, more engine wear, more maintenance," said John Banta with ABATE.
Right now, AAA says it does not know when E-15 will reach Florida. It's only available in Nebraska, Iowa and Kansas.
However, AAA believes E-15 can be five cents cheaper than the gasoline many Floridians are pumping in their cars at this moment.