What crucial convenience problem did Jim Moylan's indicator resolve for drivers using unfamiliar cars?

Answer

Determining which side of the vehicle the gas cap was located on

Moylan conceived of the arrow icon pointing towards the filler neck location, resolving the common frustration of not knowing which side the gas cap was on when stopping to refuel.

What crucial convenience problem did Jim Moylan's indicator resolve for drivers using unfamiliar cars?
inventionVehiclemeasurementtechnologyfuel gauge