A cautionary note on Aviation fuel... even the 100 octane low lead has eight times the tetra ethyl lead that regular leaded fuel had. Has to be mixed at no more than 5:1 pump to av-gas to keep it from forming lead deposits in the chambers and exhaust ports and possibly sticking the exhaust valves open. Not only that, but the reason it’s 100 octane with enough tetraethyl lead for 119 plus octane is because of the xylene, MEK, acetone, and all the other low flashpoint solvents that are mixed in it so that oxygen carrying nitrogen compounds can be blended in and stay in solution. This is why AvGas can burn at high altitudes (thin air) and low temperatures, it carries it’s own oxygen to the piston party. Rubber components don’t fare too well with it even blended down. I have it as an option (Live a mile from the local airport and can buy it for racing or aviation purposes) but I would only use it at a 12:1 pump to avfuel ratio if a lead substitute or the like weren’t available. It’s not a matter of if the rubber lines and carb parts will deteriorate, but when.