Car was with mechanic - let idle for a while - how to handle?

[5mall5nail5]

FWIW I dropped the car off with about a full tank and picked it up with just under 3/4 and only a couple miles on the odometer. It was definitely more than 1 gallon, or maybe it was longer than 1.5 hours. Either way - it doesn't represent my driving at all so I skipped it.

My inspection mechanic is a friend - considering the odo didn't move more than a few miles I know he didn't drive the car much at all. The emissions station is like a mile or two away so there's no way he did any thing "bad". The car just idled a tooooon.

Thanks all!