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The primary factor influencing gas tank placement is engineering practicality. According to Steve Yaeger from Nissan, the location of the fuel door depends on the design of the fuel tank and the car’s underbody components. Structural limitations often dictate the routing of the filler tube, determining which side the fuel door ends up on.
Ford spokesperson Mark Schirmer adds that placement is usually decided based on what is easiest to integrate within the car’s design. While dual fuel doors might appeal to some consumers, space constraints and cost considerations make this feature impractical.

Consumer Preferences and Regional Habits
In countries like Japan and the United Kingdom, where driving is on the left side of the road, right-sided fuel doors are more common.
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