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I will give him a generous tip because he didn't try and make small talk.
Update: it appears he doesn't really speak English and is going a super long way, I'm reconsidering generous tip.
Gave a generous tip even though it was a super long route, he seemed sad.
One time, my taxi driver took a super long route. I recorded his badge number and asked him to take me to a police station instead, as I wasn't going to pay. He took me to my destination and charged me the cost corresponding to the short route.