Can you do it, sure...is it ideal without doing the supporting mods, no...tune adjustments should be made....fuel system will work harder...fuel economy will go down...lower cost of e85 is negated by reduced fuel economy due to the fact that it takes more fuel to to achieved desired lambda.
There really is a good reason they put E0-E15 on the fuel filler hole
The car can run really well with a 3 bar tune on pump E10 fuel
U could run a 3 bar tune, advance the spark a little. Make a little more power but then get reduced mpg and always have to bother with mixing the fuel...if its not consistently done then fuel and spark adaptives will be all over the place...and all that for my guess is 10-20 whp