And you know what was the worst thing? During my 30K oil change, I asked the shop to test the battery and they said it was fine. Mind you, I've been having issues with that 12V battery for the life of the car. A year ago, I was measuring the starting voltage at 10.4 - 10.5 Volts and it dropped to 10.0 Volts +/- 0.1 Volts. The car would still boot up, but sometimes it took a couple of tries (and I always had to wait for the brake to pressure up (that noise you hear when you open the driver's side door after the car has sat for awhile) prior to pressing the "on" button). I don't know if I'm getting any better mileage because of it (nothing is leaping out at me for it), but I can at least start my car and that is a good thing!