It all depends on the service history of the car as well, If its been lovingly looked after its less likely to go burning oil. As said all engines will burn oil, its unavoidable, but the case here sounds excessive.
Get someone to follow you up the road and see when the smoke is coming out of the exhaust, you wont notice it half the time as your looking at the road ahead I hope and not constantly in your rear view mirror.
With that much oil being lost it must be going somewhere.
