There was a big fuss this fall when the Mexican government announced they
would require a $400-$800 deposit (depending upon year of car) in CASH when
crossing into Mexico.  Yes, cash money.  This would have meant you had to
exit via the exact border crossing where you entered.  Senators from the
border states threw a fit, people complained and boycotted and shortly after
implementing the plan, the Mexican government backed off.  Now (as before)
pay about $11 and they take your credit card info.  However, I'd check with a
mexican consulate before heading south just to make sure.

Doug Demarest
Minneapolis, MN

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