Originally Posted by
IAH-OIL-TRASH
If you're travelling on OPM, then booking a car thru United may make sense, but generally, the extra money paid for the miles is a really bad deal compared to rates you get elsewhere. If I'm spending my own money, I would never rent a car through United (or use RocketMiles, etc).
Not sure if you read my follow up post...I did comparison shop and the rate was the lowest one available relative to booking directly with either AVIS or National. Could I have gotten a slightly lower rate through booking blind on hotwire? Maybe, but then it'll take me much longer to pick up and return the car etc...