anyone else noticed a larger drop in mileage lately? Mine is a 13' hybrid version, but as soon as the winter gas mixture kicked in it dropped and then when the weather turned real cold here in the east, it dive bombed. Running anything to do with heat, (heater, seats, steering wheel) just like running the AC, seems to make it hurt worse too. I'm talking several ,pg compared to spring/summer/fall. Ouch!