Originally Posted by
soitgoes
In the US, it is normal practice that restaurant card swipes are AUTHORIZED (not charged) at 1.2 or 1.25 times the charged amount.
We've dined in the States dozens of times. No restaurant ever pre-authorized extra sums. Only once in an Italian place in New York City we've encountered a 15% tip written in a receipt, but even in this case they pre-authorized my card without the tip.