This is a personal decision. You should take into account your location (NYC versus Sandusky Ohio), how often you use the service, and how much you can spend. For a cash gift, think about the cost per month. Then, ASK other customers you know. Find out what they do to gift their car service providers.
Several answers seem to exis:
YES
Money
Father Christmas by The Kinks
You should not give this for Christmas. It's not considred thoughful.
A boy should only give a girl what he can afford for Christmas. Instead of cash, she can get a gift card to a nice restaurant or for iTunes. If cash is the only option, 25 dollars is a good amount.
Yes, you should let his mother take him the money for Christmas. He will be happy that he got the $300 and maybe start liking you.
Rockefeller believes that he should give his money away.
You should give him none
I
Give it a house cat. They will get along great together.
give him a pair of nice warm slippers
Buy flapjack and give it to Stuart.