My Prius has been super foggy and sometimes frosty inside this winter (first real winter it's ever seen). We do mostly short trips, so not enough time for the little engine to make much heat. I've started just leaving the defrost blasting with the AC on for all our short trips. Probably doesn't drag my mileage down quite as much as having to let it warm up for 10+ minutes to clear frost off the inside... I need to look into desiccants and see if a couple socks full could solve the problem using less energy.
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