Hot starting question

I'm almost certain it has to do with fuel formulation. Modern gas evaporates very quickly, and when your car is warmed-up and sits for a while on a decently warm day, the gas in your float chambers evaporates and empties your carb. So when you come back to start the car, you have to crank it for a couple seconds to get the fuel pump to fill the float chambers and then get fuel into the engine. My '70 Duster does the exact same thing, and it's especially worse on hot days. Nothing we can do about it either; in fact, this quicker-evaporating gas probably gives us better fuel economy and power than olde-tyme gas because of better atomization in the carb venturis.