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Yes, it is E98. However, as I understand it (from someone involved with the Rahal/Letterman operation), if they went to 100% ethanol, the ATF (Bureau of Alcohol, Tobacco, and Firearms) would be involved.
The Alfa Romeo Type 159 "Alfetta" ran on "dope" fuel for the 1950 and 1951 F1 seasons. The same goes for the Mercedes-Benz W196 F1 car of 1954-55. A number of the pre-war Grand Prix and Indianapolis cars (Miller 91, Alfa Romeo 8C 2300/2600/2900, Maserati 8C, Auto Union) used AvGas, Methanol, Benzol, etc for fuel. Some cars used mixtures of more than one of these.
I should mention too that petroleum is used in the manufacture of ethanol.
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