100 best money moves
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Boost your chance of a free rental-car upgrade by booking a midsize car. Think Nissan Sentra or perhaps Dodge Avenger. Midsize tends to be the most popular vehicle class -- and if the rental company runs out of the kind of car you reserved, the on-duty agent may well upgrade you to the next category at no extra charge.
NEXT: Move 43-46: Save on a last-minute vacation
Last updated April 28 2011: 11:32 AM ET