Usually I just keep it in my IWB as I can still get to it if need be which I have had to atleast once when I noticed I was being followed by unsavory characters but thats another story. If not holstered I may put it in the center console or on passenger seat but that is a rarity. The only time a gun is left unattended in the car is while at work and it is stored under the seat with the magazine with me or cylinder unloaded and ammo with me if its a revolver. Everywhere except work the gun is on my person. Not a fan of having a gun stolen from my vehicle if avoidable.