pnixb

This was well worth the reading time, THANKS ALL !

misternatural

i ran the Lab in a gasoline refinery for several years and did considerable testing on ethanol, as well as MTBE and virtually every octane booster available at the time. my only real problem with ethanol is the fact that it is infinitely miscible. and as such is make a convenient hide-out for water. it has excellent BTU value and excellent octane value ( usually a research octane -RON- of between 110 and 115. it is a very clean burning fuel as well. but all you have to do is pour yourself a tall glass of "Corn liquor" and then add say 50ml of water and stir to indicate it's tendency to absorb water in motor fuel.
several people here have stated it's more about the octane in this case than the content, or lack of content of ethanol. and they are right on the money.

mikeinatlanta

My hot rod is a 700+ hp naturally aspirated 8,000 rpm E85 burning Windsor. Love that gumment race gas. As for 87 in equipment that sits for a long time: All gasolines lose octane over time. Even though there is not performance gain, using a higher octane will ensure that octane loss over time will not harm the equipment, so if it calls for 87, running 90 is a good idea for octane loss margin. Second bonus is that higher octane gasoline loses octane at a slower rate than 87.

Munkeebutt

I have been filling up my 2.7 with Exxon 93 octane for about 8 weeks now. I notice absolutely no difference in power or mpg's. I'm about to switch back to good ole regular.

seventyeight

Munkeebutt

I am definitely on flat ground around here.

Wexford F150 Owner

So this all being said, say I stop at Sheetz and am deciding between their Regular Unleaded with up to 10% Ethanol and 87 Octane and their other Ethanol blend with up to 15% Ethanol and 88 Octane, which would be a better choice?

Scode68

Not surprising since when NJ switched to that crap I got worse mileage on my 1999 F150

Ricktwuhk

If you don't have a Flex Fuel 5.0, then you should be using E10. If you have a Flex Fuel 5.0 engine, you could use E15. You will get slightly lower MPG. If you did a blind test, you would never notice any performance change.

02fx4dude

E0 in my old Ranger seems like it gives better performance, not much but noticeable, and an extra 1-2MPG daily driving. But it costs 40-50 cents more than the E10 gas same octane.

I don't notice much difference in my ecoboost switching between e0 and E10.