Locking gas cap
Picked up a Stand locking gas cap 10510 for my 2019 E450 class C. At my friendly neighborhood auto parts store. $14.00. No tether though. I might make one up. We'll see. I park my RV in my driveway so...
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I also use locking gas caps on 3 trucks, but they are easy to break off with a screwdriver. YouTube post many videos of how to do this and it works in less than a minute. Not too noisy unless they also use a hammer. I have done it when lost a key.
