Is it normal to have to add air to your tires frequently? About every two weeks my TPS light comes on and the tires are low. I haven't had the car long (August) and I put new tires on right after I bought it. It could be a combination of the low profile tires, the car not being driven all the time, and it getting cold; however, I'm curious if this seems normal or if I should have the tires checked. Thanks.