Always enjoy reading mileage threads, but hvaen't seen any posted with the 24MPG as of yet. I guess it's early.
Although the EPA ratings are not etched in stone, at least they afford comparisons, so if Dad is concerned with fuel mileage, have him look at the EPA fuel mileage site. Only recommendation I can give is to make certain the Jeep is a '01 or newer as that has the 5 speed AT. It is said that teh '99/'00 can be reflashed to add the 5th gear, but have no experience at this.
As was stated in your other thread, the AWD (which is an on damand system, not AWD) system uses no more fuel than the 242.
Here's a couple of examples:
2002 Jeep Grand Cherokee 4WD
Jeep Grand Cherokee 4WD 6 cyl, 4 L, Automatic 4-spd, Regular 13 city 18 hwy
Jeep Grand Cherokee 4WD 8 cyl, 4.7 L, Automatic 5-spd, Regular 12 city 17 hwy
2004 Jeep Grand Cherokee 4WD
Jeep Grand Cherokee 4WD 6 cyl, 4 L, Automatic 4-spd, Regular 14 city 19 hwy
Jeep Grand Cherokee 4WD 8 cyl, 4.7 L, Automatic 5-spd, Regular 14 city 19 hwy
To sum it up, you'll find no difference in mileage with the QT/QD/242 systems in a particular model.
Don't know who will be paying for the Jeep, but I'd be more concerned with the cost of repairs then to the fuel mileage. You'll find that the WJ's, with mileage are money pits, and stay away from the AZC Limiteds/Overlands, unless you're willing to spend $1200 to fix the system, or you can do the work yourself. Look for a Laredo 4.7 with QTII and you'll be good to go, but you're still looking at window regulators, radiator, starter, HP PS hose, maybe already replaced, heated seats that are broken, and depending on the area of country, pay particular attention to oil pan rust and also under carriage rust. The pans are paper thin and won't hold up to much rust, so if bubbles have started a new pan will be in the future. Good luck.
Last edited by Turbonut; 10-24-2009 at 05:17 AM.