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I will also confirm a recalibration for winter mix. I had to adjust my UG for my Subaru at the end of December, it seems to be slightly optimistic, but thats okay. Even in an over-calibrated situation, I can still tell I'm doing good or bad for the tank.
I also have issues with my Subaru for extreme colds (PA extremes lol). My mileage always dips if we're down near zero or below. The Subaru runs extremely rich when cold, so the UG will be off for me.
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