The way you buy (and measure, and conceive of) fuel is not the way everyone else does.
This gas station has a separate areas for refueling motorcycles, reflecting the spatial inefficiency that would result from riders queueing up by the pumps to refuel, as well as motorcycles’ relatively small tanks and the corollary effort of the attendant having to move the refueler from one motorcycle to another in rapid succession.

Perhaps also the risk of a high concentration of queued people standing next to a gas pump, and smoking as a popular way of passing time. The risks of waiting behaviors.