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Serious fuel thieves do not bother with siphoning fuel out of your truck's filler pipe, they punch a hole in the fuel tank (most tanks are plastic these days) and drain it. They are harder to be observed because they can approach from any direction, not just from the filler side, and are underneath your truck where most folks would not casually see them, instead of standing next to your rig sucking on a hose with a gas can at their side.
A locking gas cap will only stop the amateurs and they will move on to the next rig, which is about as much as you can hope for.
Having one more key, and having to mess with it on every fuel stop, is just a PITA that I don't want to deal with. A locking fuel door is asking for body and paint damage if they pry it open.
I remember back in the 70's, they had a spring contraption that you screwed down into the filler pipe, which prevented anyone (including you) from sticking a hose down into the fuel. It worked pretty well.
But, you can only do so much to protect yourself. If someone wants your fuel bad enough, have the time, opportunity, and isolation from being seen, you are going to have an empty fuel tank, no matter what steps you take. If you are lucky, you won't have to patch a hole in the fuel tank.
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