Fuel for Gassers

On every gas pump that I have seen, the little sticker says "no more than 10% ethanol" meaning the fuel is mixed with the last batch, etc, and it may or may not have 10% ethanol. This is why your fuel mileage may vary from tank to tank. Some stations like WaWa and others have non-ethanol fuel as well as ethanol blend fuels. Some have the E85 which can be used in vehicles like my HHR toad. I always get the non-ethanol fuel for my small engines at home, including my emergency generator. In the motor home with the GM 8.1L engine, I used the E10 87 octane fuel and experienced no issues in 100,000+ miles of travel. I even used the 85 octane when in the Western mountains but always added 87 when I was going to lower altitudes. I never used any higher octane fuel than 87 and never felt the need. I didn't monitored my fuel mileage and didn't really care. Fuel costs were the price I paid to travel in an RV. To keep my in tank fuel pump cool, especially in hot weather, I always tried to refuel before the level got below 1/4. I guess it worked because I never had to change my fuel pump.