What's better for gas mileage-- using 2wd or Auto(4wd)?

[tbled22]

I just bought a 2002 qx4 and I'm wondering what mode is better for gas mileage--2wd or Auto mode?

[MagicM]

Leaving it in Auto 4wd will just leave the car in 2wd unless it detects slip. So unless you live in some snowy area or up in the mountains you probably wont see much of a difference.
Modified by MagicM at 9:26 PM 7/4/2008

[Buzzman]

Leave it in 2wd, especially on dry roads.You shouldn't run AWD or 4WD in dry conditions. (unless you're off road, maybe).Too much stress on the system, as well as poorer mileage.