Yesterday I picked up a Uber partner (from Tucson) from the train station. Drove him to a car rental agency not too far away. The agency was closed on Sunday, and I suggested that the agency at the BHM airport will be open, and about 12 minutes away. He called the rental agency (while I waited) , and he could pick up his car there. Out of courtesy I gave him a 5 star rating... even though he didn't tip! 4 star is as high as I go for non tippers. Although I did make a exception in this one case. Any remarks?