A few years ago Oregon made a shift from no ethanol, to all stations all gas at 10% ethanol. At the time, using my prior car, I made a very careful multi tank comparison of the effects of the shift to ethanol. What I found is that there was a small mpg decrease for city driving, no mpg change for highway driving.
On a recent trip to the East coast I used ethanol all the way through flyover country, got great mpg, and enjoyed lower prices.
BTW locally, I've compared mpg of name brand vs off brand gas. Name brand does tend to be better and worth the money. But sometimes not. Sometimes I think it's the particular gas station, not so much the brand of gas that makes a difference (due old vs new tanks in the ground....or other factors).
Principles supporting my driving style for even higher EX mpg:
Have the engine operate as little as possible, especially when standing still or moving slowly; while also meeting my demands for power and maneuvering. This means most battery charging while cruising city streets and rural roads, max regen from slowing down and downgrades, and only using heater or A/C when the engine is on for other purposes.
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