That’s the idea of Flex-Fuel. Figure real world mpg on ethanol vs. gas and buy one or the other depending on the price difference.
Out here in the middle of Iowa, E85 is frequently cheaper mpg-wise, at least in some pickups and SUVs. A loaded Suburban or minivan might get only a 2 mpg hit on E85 vs. regular.
Right now, with regular under $3.00 most places, E85 isn’t worth it, but that can change fast when prices spike suddenly.
Wow, reg gas under $3, a little jealous...