"Thieves can catch their victims by complete surprise — when they are pumping gas or paying their tab inside. Gas station customers often leave their car doors unlocked and items like purses and wallets are left in plain view. A thief is able to drive up next to the victim's car, open an unlocked door, grab any valuables within reach, and quickly drive off. It happens in a matter of seconds. Follow these tips to help protect yourself from becoming a victim of theft at gas stations."
Source: National Crime Prevention Council