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you give driver $10 and ask for $2 back on 6.60-6.80 fare??
that is beyond cheap! give him the whole $10 you tight ass!
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QFT, basically.
I think the rule is to round up to the next highest reasonable cash amount. Overtipping is standard. This person got you to your destination alive, and didn't rob you.
Thus, a $10.75 cab ride and a $12.50 cab ride both "cost" $15. There is a no man's land between $8 and $10, because you can't give the guy a Hamilton for a $9.50 ride.
Also, if the cabbie breaks out the diggery-doo he gets a bigger tip.
