Fuel for Gassers

I've checked the mileage religiously on our 2001 Adventurer and our 2013 Adventurer. It's hard to put an exact number to the mileage difference due to the number of variables involved, but with both motorhomes we've consistently gotten 1 mph or more traveling the same routes when using the non ethanol regular. Given mileage is usually between 7 mpg and 8 mpg depending on the route traveled. An additional 1 mpg with non ethanol makes it cost effective to use it when available.