A few things. Our Studebaker club had a presentation today at the Spring meeting from local representative of NAACC (ie, Canadian equiv to the US SEMA, and keeps in close contact with them) General consensus was
-don't run ethanol fuel in any concentrations above a percent or two, in any car older than 2001, unless you go through a tank within a week. Never let it sit!!!
-don't store older cars over winter with fuel in them, run them dry/drain them. Tank liner material (bad news) needles and seats (bad news) and pump diaphrams are very affected. Fuel stabilizer can also cause problems when being burned in the engines especially if the percentage gets too high.
-In Canada, our premium (say 93 octane) is pure gasoline, for now, while regular can/will have up to 10% or guaranteed 10% standard ethanol in most provinces. Midrange will be 5%. So, buy premium. We do not have the option (yet) of buying leaded aviation gasoline of the 130 octane variety
-Adding a 1 in 50 in Marvel Mystery Oil or two stroke oil tends to be beneficial, especially if there is any ethanol in the gasoline. I always used to add 1 in 50 diesel fuel to my Studebakers when diesel had sulphur compounds in it, as an alternative to MMO.