First, it is NOT illegal to use 100% gasoline in gasoline engines. The EPA restricts the availability, but if you can find it, use it. The actual increased mpg due to 100% gasoline blunts the EPA contention that ethanol burns "cleaner". Combined with the information that a minimum of 1 gallon of fossil fuel is needed to make 1 gallon of ethanol, the EPA contention isn't true. With a quick look, I don't think anyone has posted pure-gas.org, which has worked hard to list its almost 7500 sources for 100% gasoline in Canada & the U.S. The website has a great zoomable map & details of station fuel octanes available & restrictions. The southern U.S., from Oklahoma to N. Carolina, south to Florida, & west to Louisiana has about half the 100% gasoline sources. The great concentration of southern stations could be due to NASCAR fans, who know 100% gasoline is best for lower compression ratio gasoline engines, which have been designed & built to most efficiently use 100% gasoline. This is not rocket science. Higher compression ratio ethanol engines (like INDY car engines) use ethanol at its most efficient. There is a good possibility that DFI is having problems with ethanol & that 100% gasoline may be the best fuel to use in DFI engines. Don't mix the two fuels for the best mpg from 100% gasoline.