4WD (4- wheels drive on demand) vs AWD
Subaru AWD can have 95% of power to one wheel, 4WD (as explained by Subaru Sales person) is 50 % power to front wheels, 50 % to rear.
If 4WD is not turned on (to save gas), then it is like normal Front wheel drive cars.
The system AWD is always on, hence uses more gas. (The system itself adds weight to the car).
AWD is standard in Subaru, 4WD is optional to RAV 4 and CRV, and is over 2000 CAD for that system.
Both systems are great option to have (if money is not a problem) in snowy icy winter.