standard is 15 to 20% the minimum wage for servers here is $2.56 an hour (I'm not sure if the is all of the US or just here in Michigan) so tipping is a lagre part of a servers pay.

As far as tipping other places unless you are in a nice hotel where someone brings your bags to you room don't worry if so just slip then a couple of bucks.

p.s. if you stop for fast food don't worry about tipping anyone

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whip me, beat me, tie me up, break my arm, but please don't break my heart

"The trouble with the world is that the stupid people are cocksure and the intelligent are full of doubt" -Bertrand Russell