What about small engines?

I've had zero issues in the multiple chainsaws I run (Stihl), or the 2" pumps (Honda and B&S) in regards to fuel containing ethanol.

And I have a couple vehicles which run on e-85. The ONLY time I have had trouble was when I filled up at an out of the way station. Truck started having some trouble starting. Once I got that tank of fuel used up there were no problems, so my guess it was an old batch of e-85 which had attracted water into it.

Edit to add: I think we could go up to a 30% blend without causing trouble to most vehicles on the road today.