I put aviation fuel in all my gasoline powered engines that aren't run very often. Since doing that I haven't had any carburetor or fuel filter problems at all.
You know why?....cause its loaded with all the good stuff we had in the 1960 leaded gas and more.
I raced with both unleaded and leaded and you engine temps will run way cooler on leaded gas....water temps will stay the same just the ouside of the engine will run cooler.....why all you have mostly now is fuel injection engines now.
Been 10 years ago since I raced....my 10 to 1 engine ran unleaded sunoco 94 and my big motor 13 to 1 ran 110. Now 94 was 1.50 and 110 was 3.00 a gallon. Guess what....the 10 to 1 with 94 took twice as much gas as my 13 to 1 110 motor.
So I used the same amount of money in gas in both engines but made alot more power and better gas millage with leaded gas.
I remmber as a kid my mom and dad had a 1963 nova with a 6 cyl with a poweglide and that thing got 28 miles to the gallon.
Really gone nowere with gas millage since....but that 63 nova cost 2500 dollars....now you get to pay 30,000 for about the same value.
Thinking back its been about 20 years since a carb on a car maybe longer.
In my street car have to mixed 5 gallons of 110 with 15 gallons of unleaded just to keep it from the vapor lock.
Carbs and hoods won't let the high temps out so you vapor lock at idle.....
Even small engine like to vapor lock if idled to long if its warm outside.
Fuel injection is coming to small engines in a few years because of the vapor lock problem.
Art