At one time, you could buy a tapered spring that you threaded into the filler neck. This would prevent a hose from being inserted, for the purpose of stealing gas.
I don't know if these still exist, or if they could be inserted into the filler necks with the restrictor built in, to prevent anything but an unleaded nozzle being used.
The best locks will only keep out an honest person. A thief that is determined, will bypass any/all locks/deterents. The harder it is get access, the more determined the thief will have to be. A detemined thief is derned hard to stop, short of a bullet......
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