I've left 10 bucks in the car as a tip and 30 bucks for gas. I labeled the gas money but forgot to label the tip money for the driver. Sure enough, when I picked up my car at Swasey's, I saw the change from the gas money with a receipt and the 10 bucks that I left for the tip
I was explained by Melanie later that the driver wouldn't take any money unless it's labeled as a tip. I was amazed by the driver's honesty and gave a bigger tip next time.
They shuttle as a convoy to keep all cars together and never exceed the speed limit. I actually saw their vehicles once on hwy 6 and sure enough they were going the speed limit. That was nice to see for myself.