If you're planning to drive to yourvacation spot this summer, be preparedto pay higher prices for arental car. As demand slipped, rentalcompanies cut back on the numberof cars in their fleets, which hasopened the door for higher rates asbookings pickup. According to someonline travel services, car rentalreservations for the coming summerare already up significantly from lastyear. Book nowto lock in lower rates—unlike airlinetickets, there's no penalty if youcancel. Avoid airline rental sites,which can cost you an extra 30% ormore on your car rental. Lastly, lookinto weekly rentals, which often cangive you fairly hefty savings over thedaily car rental rate.