I just bought one. Cost about $15. Did anyone else buy one. Are you also scared somone might siphon your gas? I have an '89 Suburban and it has a HUGE tank. At $2.50 per gallon it costs a fortune to fill. I already lost one regular cap at the pump and I have no place to put the cap. I paid $15 for the locking cap and do not want to lose this one. Any suggestions?