I tipped my delivery guy $40. The car was supposed to be delivered on a Saturday (SC is 200 mi away) but I got a call Friday night about 9PM that he'd just picked up my car and could deliver it that night if i really wanted... Of course i said yes. He checked in twice more en route before pulling in just shy of midnight. I felt like Santa had arrived. Didn't really think about tipping ahead of time, so just spur of the moment opened my wallet and pulled out 2 twenties. He definitely wasn't expecting it. I felt good about it. But I agree it's not mandatory nor expected.