Yeah, chances are they're not even going to look at the cap since newer cars are impossible to siphon these days. Have heard of local thefts (back when gas was $4-5 /gal) where they just poked a hole in the bottom of the tank and filled their cans below it - much easier on bigger vehicles with good ground clearance like ours.Kids get the gas from the bottom of the poly tank, fill their bucket and let the rest flow to the ground....
Thanks for posting that pic Phil.
I have to think that by now the steering wheel lock has run its course. Getting a modern vehicle to start without an original key is basically impossible and anyone out to steal a car knows this.A layered approach to security makes sense.
100% of gas thieves/vandals have access to stock cap. A nice chunk of them won't bother with a locked cap.
So - you are reducing your exposure with a locked cap. Mine has been on since shortly after purchase in 2019 and no problems/check engine lights.
The same goes for using a steering wheel immobilizer, alarm, cameras etc. Every layer of security you add reduces your exposure to a certain percentage of dirtbags.