Production Efficiency: During car manufacturing, it's more cost-effective for the fuel tank and fuel lines to be located on one side of the vehicle, making it easier for the assembly process.
Engine and Exhaust Systems: The placement of the exhaust system and engine components can affect the placement of the gas fill for safety reasons. Automakers aim to locate the gas fill away from potential hot surfaces and exhaust parts to reduce the risk of fire and accidents.
Fuel Tank Layout: The shape and size of the fuel tank can influence the location of the gas fill. In many cases, the gas fill is positioned where the fuel tank's opening is most convenient for refueling and to ensure proper fuel flow.
Symmetry: Some manufacturers position the gas fill symmetrically on both sides of the vehicle to achieve aesthetic balance.
Historical Factors: Automakers may have established practices and design traditions that have persisted over time, leading to a preference for a particular side for the fuel filler.
Ultimately, the choice of which side of the car the gas fill is on is a matter of design and engineering decisions made by individual car manufacturers. It's worth noting that in certain regions, there might be local preferences or regulations that influence the placement of the fuel filler.
