Previously I had a ford explorer with the V6 210 hp. With my 2720sl, I always had the over drive off on any type of uphill grade. However, in completely flat areas such as the prairies of midwest canada it rolls along so easily that I usually left it in Overdrive to save gas. I also did this down long gentle grades where you do not need the engine braking.
If it is under very little stress you might as well save some gas, but I imagine this depends on the towing power of your tow vehicle. I think the ford explorer has about 250 ft-lbs of torque and it towed easily in Od in those situations.
|