I have a strange tire problem......
I have a 2011 Ford Fiesta, purchased new in late February of 2011. It is the SE Hatchback (not SFE) with Kumho Solus KH25 185/60-15 tires on alloy wheels. For the first 5 months I added air to the tires once (and I did check them regualrly). In late July, out of the blue, the low tire pressure warning light came on when I was on the way to work. I was afraid I had a tire going down, but the car drove normally so I continued on to work. As soon as I got to work I looked at the tires and all appeared normal. When I got home and checked, the pressure in all four tires was in the mid-20s. Weird. I reinflated all the tires to 35 psi. All seemed fine for the next 3 weeks or so, until yesterday. The low tire pressure light illuminated on the way to work again. As before when I looked, the tires seemed fine. As before, when I checked the pressure, 3 of the 4 were in the mid 20s, one was in the low 20s. I reinflated the tires to 35 again. I've had a lot of cars and a lot of tires, and never before have I had a set of tires (four tires, not just one) lose 10 pounds of pressure in less than a month.
Any thoughts? My only thought is that I somehow damaged the tires on a mid July trip to Florida. We drove I-95 to South Florida in mid July. The trips were quick (600 miles,