Why are Las Vegas cabbies so weird about tips?

[DcifrThs]

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i generally tip what ever is between the cost and the next round bill number.

i.e., $12.25 = $15.00

i.e., $14.75 = $20.00

i.e., $26.00 = $30.00

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this is retarded. for a $46 fare you give $50 (~10%), or do you give $60 (30%)?? i'd hand the cabby $60 and ask for $5 back.

in terms of more realistic examples (that one is like the rarity), for a $19.00 fare you give $20?

weak ass sauce.

Barron