mazda now claims 91 is recommended. In the past I dont recall such recommendation.If the owners manual doesn't specifically say you need to run 91, than 87 will be perfectly fine.
The only thing the higher octane rating does is prevent knock and pinging.
Alcohol free should have gotten you better gas mileage. Real gas burns with more BTU's per ounce than mix does, so the engine wouldn't have to burn as much to maintain the same speed.
Nice list. Thanks for posting link. So if my gas station(thats 30 minutes away) stops selling pure, then i'll have to travel an hour away for my lawnmower gas. Yep, couple years from now, itll all be e85.
... There is no real gas on my commute to work and to get pure gas for my lawnmower requires traveling 30 minutes (out of my way) in opposite direction from my house. If this station stops selling pure, will be hard pressed to find another location.
It is possible to remove the ethanol from the fuel yourself as needed for your small engines (or any engine) fairly easily. All you need is a container, some water and a way to drain or siphon off the bottoms. Add water to the fuel, shake it up, the ethanol absorbs the water and separates out dropping to the bottom. Then drain or siphon that out and you now have 100% pure gas
You can also use the same procedure to test what percentage of ethanol is in a fuel, if any.
This is true but...
Unless you drive like a grandma , soft on pedal, flat roads, and all highway miles, and you actually track you mileage and calculate your mpg than most people will not notice the difference.
How you drive, f.i. stomping on the gas pedal will affect your mpg far more so than e85 versus the real stuff.
Also some top gasoline e85 performs better and may only be a slight decrease in mpg when using certain brands.
So e85 will always get less fuel efficiency but overall, you may not notice much depending on your driving habits. The OP probably hasn't noticed much difference because other factors affect mpg as well.
And at the end of the day, the e85 should be cheaper so $$ wise, it all balances out.
It soon won't matter as real gasoline is quickly becoming the elusive purple unicorn.
There is no real gas on my commute to work and to get pure gas for my lawnmower requires traveling 30 minutes (out of my way) in opposite direction from my house. If this station stops selling pure, will be hard pressed to find another location.
Where do you get your information from? I realize that you may think this but every performance ECU tuner in the world has warnings for using some preset ECU tunes for use with 91 or 93 octane fuels or chance causing engine damage. I do believe that you would be hard pressed to find forums that guys show their best DYNO results using anything but 91,93 or higher-octane fuels. So I am wondering if this is a personal belief you have or something you read? I do agree that this is so often misunderstood.Understand that higher octane numbers absolutely does NOT mean more power. This is often misunderstood. The only thing higher octane does is reduce knock and pinging, which allows you to change ignition timing. The timing change can effect power, but not nearly so much as to offset the power losses of running ethanol vs pure gasoline.