[roosterk0031]

My wifes 2010 Impala does about 24.5 E85(last 3 tanks), 28-29 with E10 with her driving(about 15% reduction). E85 ratings of 14 mpg city, 22 hwy, 17 combined. (I need to run 3 tanks of E0 thru it to get that baseline)

Her previous suburban did 12.5 E85, 15 E10 also about 16% reduction (see Fuelly 2002 suburban, separate fuel log for each fuel use)

At current local prices E85 is just barely cheaper per mile with the Impala. ($3 vs about $3.60 gallon).

When changing fuels, or making my own blends it takes the computer a little while to adjust the fuel trim, making it impossilbe to do A B A test IMO, best to run 3-4 tanks of each thru to get a multiple tank average for good data.