Is it custom to tip taxi driver in your area?

Not usually. Generally we only tip local taxi drivers if they perform an extra service which may even include simply driving sanely and safely. If you tip for no reason it encourages them to gouge customers as well as to push for rate increases, which they just received a few months ago. It also causes them NOT to give rides to any poor-looking Mexicans in favor of giving preference to foreigners.

Use your best judgement. Older drivers I'm more willing to tip for no real reason.

Is it custom to tip taxi driver in your area?

Only if they help with bags/packages.

D