I’m not so much looking to field a discussion, but spitting this out because I’ve tested this for quite a while now. I know it’s not news, but I’m one more confirmation.
About 6,000 miles ago, I stopped running gas with ethanol in it. I’ve got a '96 Burb that was stuck at 10 mpg no matter what I did, how I drove it, etc. I switched to ethanol-free gas. First tank 12.6 mpg. Second tank 14 mpg. And it has remained at 14 mpg every tank since then, no matter how I’m driving it.
My grandpa once had this massive Cadillac, I believe the longest one they ever built. It had the same motor that was used in Sherman tanks if I remember correctly. A 500 cu in or so I believe. He used to say, “It burns five gallons an hour, whether it’s idling in the driveway or running 90 down the road.” I’ve owned a lot of vehicles with the Chevy 350 in them and I’ve always gotten about 15 mpg, and that didn’t really change much no matter how I drove them. That’s what they got in the 70s and that’s pretty much what they still get today.
I pay 5% more for eth-free gas, but get 40% better mileage. That’s a 35% net gain. 170 miles more per tank.
If your gas mileage stinks, I’d highly recommend switching to eth-free gas for a couple tanks and check your mileage for each tank.
I sit here scratching my head wondering how it’s better for anyone or anything if maybe I’m not the only one who was getting 40% less mpg by running fuel with ethanol in it. Require gas companies to add ethanol to the fuel, which reduces mileage (drastically in my case) while requiring auto makers to meet sharply increasing mpg standards. Something tells me auto makers run eth-free fuel when they test the mpg in prototypes.
None of this really matters. Just passing it along in case it helps someone else.