Originally Posted by
MSPeconomist
I usually use a AAA rate too and prepay is rarely much cheaper, although I don't reserve my cars very far in advance, except possibly for European rentals.
YMMV. I'm on a Hertz prepay from LGA right now. 4 days, Hertz prepay < $200, Hertz and National AAA discount ~$300, DELTA Web Site Link ~$400.
Prepay done 4 days in advance.