I've seen warnings on some vehicle fill pipes that tell you whether it's OK or not to use some types of ethanol laced gaaoline. For example, my 2009 truck has an "E85" symbol with the red circle and the diagonal line through it, meaning don't use, so I wouldn't use that concentration if I could avoid it. Most Canadian and US gasoline can now contain up to 10% ethanol, and often does, as far as I know, so there aren't many options except to use it, if you really need to fill up.
I wouldn't think it would be that harmful, but I'm not an engineer or chemist. Do you know anyone who has had problems? Have you asked the chassis manufacturer what the allowable ethanol content is for your vehicle?
If you want pure gas, here's a website I found that might help. I don't know how reliable this info really is, either online, or at the actual pumps.