Auto vs 2WD - MPG Question

[Jav_eee]

A lot of cars have full time AWD, so why is it such a wear item on this truck to leave it in Auto (AWD)?

Because this is not an all-time system


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[Snakes709]

My wifes equinox is fwd and awd. She has a good set of winter tires and still uses awd for some reason. She only works about 5-7mins away so not alot of time to get the suv up to temp but her fuel economy is at 16L/100kms (14mpg) when it normally gets about 6.5L/100kms (36mpg). My truck is currently at 12.3L/100kms (18.8mpg) keeping it in 2wd. 
 

i know when i took her suv across canada, i planned my pit stops for gas and a break. Came up short on one of them and couldnt figre out why the fuel economy went to ******. Didnt realize i accidentally hit the awd button.