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locking gas caps are to a point obsolete now. All vehicles have an anti drin valve at the bottom of the filler net to prevent gas from pouring out in event of a rollover. Esentially it is a ball at the bottom of the neck which seals the tank when turned upside down. This ball makes sifoning next to impossible. The only thing they will stop is someone pouring something down your filler neck like sugar or something
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