Octane help

[olredalert]

----For several years now I have filled up the old cars that need premium with 103 octane racing fuel at the beginning of the year. Then, as I use them and bleed off some of the 103 I re-fill with 91 octane marine fuel (no ethanol). I have a regular gas station near me that carries marine fuel. That 1st tank is a bit expensive but I hardly ever run thru a tank in a summer and the cars run great. I would hazard a guess that I'm a bit lucky living in a heavy boating area as well as being able to buy 103 at the pump, but Ill take it!.......Bill S