I thought you were leaving the car longer spurts unattended.. not just a week. Honestly that's pretty overkill. If you are leaving your car for more than 3 weeks at a time I would say you should plug it in more, but once a week is just too much! The other fun suggestion would be the front grille like in Canada we plug in our cars, but fishing it out from a tucked place is just not cool. Another suggestion that isn't that great either would be to fish it in through the car and mount the plug either in some place crafty or just let it hang under the dash. But at that point I would just rather open up the hood