Oregonians have an obligation to keep Iowa farmers wealthy.
Actually, it’s no mystery to anyone who wants to keep track of their mileage — preferably on a road trip. 10% is about right. I live in the heart of ethanol country and will not use ethanol unless the price diffential makes it economical— which has never happened. BTW, except in rare circumstances ethanol won’t damage your engine and can be a benefit in below zero weather.