1965 - The tragic deaths of Eddie Sachs and Dave McDonald after the 1964 Indy 500 forced the fuel to be changed from gasoline to methanol. The fuel was in fire protective tanks off to the sides of the car with two mandatory pit stops to avoid such a tragic crash. The tanks were smaller in size compared to years previous. Only a handful of front-engine roadsters remains as the rear-engine cars keep dominating the circuit. The fuel change would not happen again in Indy history until 2005 when the fuel was changed to ethanol, which is what the Indy cars run on today.