I monitor gas mileage in my truck pretty closely. Even resetting the fuel trims and running a couple tanks, E15 doesn’t really change mine that much over E10, maybe 1 mile per gallon less. Now on the other hand E85 is closer to 5-6mpg less. It all depends on how much less it costs at the time, but overall E15 is slightly cheaper for my use case. Any savings I might have is more than taken away by filling up my equipment, diesel is crazy now and no ethanol gas is right behind it.
I monitor gas mileage in my truck pretty closely. Even resetting the fuel trims and running a couple tanks, E15 doesn’t really change mine that much over E10, maybe 1 mile per gallon less. Now on the other hand E85 is closer to 5-6mpg less. It all depends on how much less it costs at the time, but overall E15 is slightly cheaper for my use case. Any savings I might have is more than taken away by filling up my equipment, diesel is crazy now and no ethanol gas is right behind it.