These are almost equivalent to "bait and switch" promos. Unless you value your time at $US1.15/hr or less it aint worth the typing. And getting ff miles costs closely to what extra you pay.
I book almost all my car rentals via
www.orbitz.com and
www.veteransadvantage.com (a pay site for discounts for veterans). A few were booked on
www.travelocity.com and the great $9.99/day deals for FR,SA and SU were booked on
www.enterprise.com directly. Itsa almost always a total waste of time using the car rental sites specials.
MisterNice