Although not related to better fuel efficiency, unless avoiding getting stuck in a snowbank and having to sit for hours with the engine idling counts, I've run into a problem with a set of winter tires I bought and the TPMS sensors. I got used rims for this car with Toyota TPMS sensors and also got a Techstream cable and program to be able to put the new codes into the ECU. But I've run into a problem. The codes are written on the sensors themselves. But the wheels already have the winter tires on them. So now I either have to take the tires back off, or just drive around with the TPMS light and warning beeper on all the time.
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