So you're suggesting E0 returned a 6% increase in fuel economy. I'm a consulting engineer and have worked for three of the world's auto manufacturers, and I have to say, a 6% bump in fuel economy is outside the margin of error. That said, given the vagaries of when certain pumps click off versus other pumps (or even the same pump on a different occasion), the extra 2% can easily be chalked up to a difference in how much fuel was put into the tank.

 

I'm suggesting that the computer in the Jeep indicated a higher level of fuel economy for the leg that had a full tank of E0 than the other legs that used E10. I am not vouching for the accuracy of that computer nor am I suggesting that the driving conditions were the same (though, I was entering the Black Hills when I filled it with E0). On my other legs, the mileage ran from 23 to 25 depending on whether I was climbing mountains. Once off the expressway, the mileage dropped to around 20. I usually traveled 450 to 500 miles on a tank before filling. The tank holds 25 gallons. The vehicle is a 2014 Jeep Grand Cherokee Overland with the 3.6 liter engine and was running Michelin Latitudes in P265x60R18. I don't think I can be more specific than that since I was not conducting a scientific evaluation and my comment here was merely an observation.

For the record, Jeep rates the vehicle a 17-24 and says the range is 469 miles on E10 and that the range is 370 miles on E15. I have always exceeded that E10 range doing exclusively expressway driving except when going up mountains and then I've come close to it. I don't tend to speed (at least not much) as I got most of that out of my system many years ago - a lot of it driving on the autobahn.

 

The non-ethanol boat gas in Florida runs from 35-50 cents more than blended. I usually see it in 89 octane, so it's not that much more expensive than blended. Performance and mileage are better 8-12%. It's about a wash, but interesting nevertheless.

 

Are you saying you think fuel economy is between 8 and 12 percent better with non-ethanol fuel?