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Keep in mind, it's really hard to siphon gas out of these trucks, but a lock will keep someone from dumping something in there. If they want your gas, they grab a gas can, crawl under, take a Philips screwdriver or drill and punch hole in tank, fill gas can, and leave, not to worry about the balance of the gas to spill out.
With the baffle in the filler necks of a LOT of vehicles since the late '90s, siphoning gas has pretty much gone away. If someone took your gas you likely need at minimum a gas tank repair if not a new tank, because someone punched a hole in it and you've got a puddle on the ground.
That said, I've been putting locking caps on every truck I've owned except the wife's, simply to keep people from putting anything in there that shouldn't be. I have lived in some questionable neighborhoods in the past, and EVERY neighborhood has that one person who you just can't trust to not do something incredibly stupid.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
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