The "energy current" when pumping gasoline into a tank is larger than what those achieved by Tesla's Superchargers (which take ~40 minutes to 80%). Thus gas stations can have much larger throughputs than comparably sized Supercharger stations.
Which is not a fair comparison because gas stations must meet 100% of the refueling demands of gasoline cars and charging stations only need to meet a tiny percentage because most charging takes place at home or at work.