I go with the sidewall limit (51 front, 44 rear), but fill first thing in the morning, before I've even rolled the car out of the garage. Once they're warmed up, it's not unusual to see them at 55/48 or even a little higher. If we get a really heavy snow, I'll drop them down into the 35-40 pound range until the roads are clear, then pump them back up. It helps to have your own compressor at home. I actually have two, one I bought for air stapling to put in trim that I picked up for cheap at Harbor Freight and one that's a combo jumpstarter, compressor, inverter. Both work great for the work I make them do (pretty light duty stuff, never any prolonged jobs).
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