Fortunately, in our area (Iowa), we can usually purchase 87 octane gas with no Ethanol. This runs great in the Model A. Although you never know for sure what you get as illustrated by the following:
Recently my brother filled his Caddy with gas labeled as 87 Octane/NO Ethanol (and by the way, his caddy runs well on 87 octane). Upon leaving the station the car began to run rough and his "check engine" light came on. He went immediately to the Caddy dealer, they hooked it up to their computer. Result was the gas had 20% alcohol, they advised to drain tank and put in gas from another station.
He returned to the station, where he purchased the supposedly non-alcohol gas, and showed them the report from the dealership. The lady shrugged her shoulders and could have cared less.
We do pay a premium for Non-alcohol gas, makes you wonder just what we are getting. If it had been 10% the car would have run OK and he wouldn't have known it.