Stop in for a cup of coffee

I understand and agree about clean cut-off and coast to check plugs. For a street car it seems like bit should be an honest mix versus drag car. Idling vs WOT will show differently. Do you check idle. Then cruise. Then WOT and verify all are good for a balanced engine. I have fear that in their testing WOT could be perfect but idle or cruise lean. So, ideally, to me, it seems cruise would be very important check for a street car. I could be wrong