How Much Should I Tip?

Sooo I always tip my servers, drivers, etc. but I just reserved a round trip to a show tonight and it was $110 😭 I'm just trying to be responsible and stay off the road since I will be drinking but over $100 for an hour round trip is actually insane. What is an acceptable tip amount? I definitely don't want to insult my driver but I'm also not made of money. I also never go out and this is a special occasion pls help lol