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heres my contribution
i have mud tires on my daily driver. yeah, i know.... i'm working on it.
anyways, they have a 50 psi max rating. i've been running them at 45 psi with good results. i've noticed my last 2 tanks were about 2.5 mpg lower than normal. so i checked my tire pressure, and they were all at around 33 psi. guess i need to check them more. i know the colder weather made the tires "lose" air, and i'm sure the colder temps are affecting mpg due to longer warmups. but i pumped them back up and waiting until next fill-up to see if it made a difference.
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