I've been running premium (93 Oct) pump gas for the last 1500 Hr's. The above statement is a concern, but not if you are a frequent flyer. Otherwise, at least mix it with 100LL in the planes tanks.
The other issue is vaper lock. The fuel FROM the tank should be under pressure at all times. It is impossible to get an operational vapor lock if the fuel is always under pressure. The automotive industry achieved this by putting the fuel pumps IN THE TANK. I did it by having a AUX fuel pump in the cockpit AFTER the fuel selector. This pump turns ON automatically if the carb/fuel servo fuel pressure goes below a certain setting. I've NEVER had a fuel vapor lock using this Technique. Yes, after HOT restarts on a HOT day, I have seen the pump cycle fsometimes for :30 min, but that what the system has to do to maintain vigilance over vapor lock.
The last issue is fuel system component selection that are ETHONOL compliant. Tank quick drain "O" rings, Oil quick drain "O" rings, fuel hoses, and all other fuel system components MUST be ETHONOL compliant. This is what the auto industry has done to cars since the late '70s.
As far as engine valve guide and seat wear issue are concerned, Lycoming changed over to non-LL materials in the '70s, continental sometime after that. If you have a Lycoming engine, look for a "C" stamped on the cylinder head just above the intake manifold. That denotes the changed valve guide and seat materials.
Right now 100 in Florida is averaging $6.00/Gal. 93 OCT pump gas is around $4.10/Gal. Major savings per year for hauling gas to the airport when you're flying over 150 Hrs/yr at roughly 8gals/Hr..........