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OTOH, if he gets me to where I want to go, as efficiently and quickly as possible, I tip 10% of the fare including tolls.

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Wow, you go all the way up to the double digits?

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yeah this feels right. for an airport run its going to be 3-4 bucks to LGA, and maybe 5-6 to ewr. around town, a 10% tip will rarely exceed $1.50, which is pretty close to the result you get under the "round to the next dollar, unless < 30cents, in which case add $1 and round up" rule