I always ask cabbies to keep the change if i see that they provide honest & good service.
Some cabbies are quite schemming.(Not refering to u Poolman.

)
When u board a cab, let the cabby noe ur destination, some will ask: where do u wan me to go by ar? PIE or CTE?
Ah-Ha! Here's the trick.
Majority of them are asking becos they don't wan to get into trouble when the patrons accused them of cheating.
But some are jus plain schemming.
They'll purposely test ur knowledge of the road. If u say "anything" or "up to u" den good game.
However, there're many good cabbies aound too, rite Poolman?

Cheers.
C.K