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I hate to take this conversion way outside the realm of this forum, but I experienced something similar on my wife's SUV last year.

She found herself having to fill up frequently, and even after filling up the gauge would only read about 3/4 full. Then by the end of the day, she was on empty again.

It turns out she had a faulty canister purge valve that was allowing the evap system to intermittently pull a vacuum on the tank. The poly tank would partially collapse, affecting both the volume of the tank, and the accuracy of the gas gauge. A $30 part and some scraped knuckles later, everything was back to normal.

Maybe relevant, maybe not. Just saying that I don't think fuel siphoning is as prevalent as it used to be. Modern vehicle have devices that prevent siphoning, and quite frankly I don't have enough faith that kids today have the know-how or the stomach for such things.

Kevin