[seowulf]

I would suspect that some of the loss in mileage is because the engine is not optimized to the blend.

The corrosivity of ethanol is probably also a factor, making it necessary to perform regular maintenance more frequently. If that’s not done, mileage goes down.

[hadaclueonce]

I would suspect that some of the loss in mileage is because the engine is not optimized to the blend

Tell that liberal BS to my fuel lines.