Gas stations are an exception: They will usually pre-authorize a certain amount (usually some number that is not likely to be exceeded by reasonable gas tank sizes) and adjust downwards once the final amount is known.
This is different from having different amounts in the chip transaction and in the "actual" transaction amount fields.
This was annoying when gas prices were very high. We had a van with a massive tank and the pre-auth wasn't enough. We would hit the limit and need to drive to the next pump to continue.
This is different from having different amounts in the chip transaction and in the "actual" transaction amount fields.