Over a year and a half with mine and I almost always start driving right away in 80 econo. I never had a stock setting until recently when Jody reburned my chip, but I don't use it anyway. Only on the very coldest days I would put the chip on the 40 tow setting. The reason is just because the injectors were super noisy in sub-zero temps, and usually there's snow on the ground at the same time, which makes driving a bit squirrelly with extra power.