At the time, I was driving a GMC 1500 pickup. Even allowing for that, they set it on high. I know the tire shop used to use a torque setting extension between the wrench and socket. I'll have to watch next time to see if they still do.

+1 on the upstairs fireplace conversion. We've done it to both of ours. Get the non-vented kind otherwise half the heat goes up the vent. Non-vented non-electric with a thermostat works like a charm. Set it and forget it. Our downstairs set is in a wood stove type fireplace set out from the wall so to switch it back to wood is relatively simple. Uncap the chimney, set the logs out, and pull the gas line out of the ash dump.