For those not familiar with the ESOF system or part-time 4WD, please note that driving in 2WD with the hubs locked will cause increased drag and lower MGP. While OK for the duration of a snowstorm, ie a day or 2, not so good for the entire month/season/year.

Here's where the extra drag comes from (in 2WD, front hubs locked):
Front tires drive the axle shafts, causing the ring & pinion to spin, turning the front driveshaft. This causes extra wear on the inner spindle bearings, carrier bearings, pinion bearings, pinion seal, t-case input seal & bearing(s).