Gannon wrote:I woulnt worry about it, 1/5th of a tank is nothing for a fuel gauge to be out. Remember that the fuel gauge only displays tank level, and because the tank is not a uniform shape, it is a poor indication of actual fuel left
Why are you looking for a lockable fuel cap? Isnt it covered by a flap that can only be opened from inside the vehicle?
Actually I have been around after a petrol theft incident at Gnaraloo Station. One of the fishermen guests complained that someone emptied one, or some, of their tanks. Very odd, because Gnaraloo is so far away from anywhere, the only likely possibility would be other guest(s) robbing them. Most fishermen there bring big boats up for deep-sea fishing pulled by 4wds, so they'd use a lot of petrol. I know why someone might want to pinch petrol up there, but that's very dirty, underhanded and in a place with so few people, a very high risk of being spotted and caught. Perhaps they did it while everyone was asleep.
Only opened from inside the vehicle?

Actually a guy at Auto One told me of a way it can be opened, stealthfully.
I'd rather not discuss how on a public forum though, for the safety of Subaru owners.

The most obvious way would involve denting and scratching the body panels.