New gas, old gas, even dirty gas, it really didn't matter. You poured it in and it burned. Once enough crap went thru the fuel system, you dropped the glass bowls on the fuel filter and cleaned them. These products were made for a world before our current pristine fuel standards......when "whatever you were lucky enough to get was good enough".
So, in a world with folks in a tizzy about E10 or E15 in their lawn mower or Evinrude, I can only chuckle.