My FX45 is using a bit more oil than any new car I have. It has about 15K miles and use about a qt every 4K miles. I do often get a small white puff when I start the car when cold. The car is parked on a level surface. How much oil do your cars use?
FYI: White smoke seldom has anything to do with oil; it's usually water/coolant being burnt from a bad head gasket. If the smoke disappears within a minute or two as the engine warms up then there is nothing wrong with the engine. Black smoke is usually from running too rich and blue smoke is an indication that oil is being burned.