E85 in a dirtbike?

[po-po 5.0]

so if all you can get is 91 octane just put the e-85 with it to make e-30 I would not recommend e-10 in any engine for the runnability. e-30 is a good mix
ranney.com - Fuel Blending Calculator

I fail to understand how a little alcohol is bad, but more is good.

 

[oneSVT]

this one is better Miles Per Dollar Calculator

 

[oneSVT]

I fail to understand how a little alcohol is bad, but more is good.

for some reason alcohol at 10% has a pound of pressure causing vapor lock. If you increase it even to don't quote me but 13% that pressure starts to go down. I have found e-30 to be the best for me. mainly because I'm able to just get it right out of the pump. If I had to calculate I might go 50/50. but it is just easy to use the e-30. besides you can put more of the crap gas the mom and pop station like gas mix it with e-10 and get by with it because the ethanol make the old and crap gas work.