I have seen, on a number of the older Tacomas, either a locking gas cap or locking fuel door...
The second gen's don't come with this option (er, mine didn't). To make matters worse, when you go to fuel up the cap is connected to a plastic line that makes it dangle against my paint!
My wife's Rav4 has a locking fuel door with a clip on the inside to hold the gas cap away from the rest of the vehicle... seems like I would gladly have spent an extra $50 on my Tacoma to get atleast one of the two.
Reason this comes up - I am in training in League City, TX, and I witnessed some kid trying to syphon fuel out of a truck in the parking garage. I chased him off, but I obviously didn't stand guard.
I think I am going to replace my cap with a locking metal cap. Any suggestions as to a good manufacturer?