That sounds excessive for those miles. (For reference I just checked my
148k mileV6 today and I've used maybe a 1/4 qt in 3k miles.) But if your aren't loosing it through a gasket externally then you have to be burning it. Have you pulled the plugs to see if they are all burning it or just a cylinder or two? How's the PCV? Ever been replaced? If it's stuck closed it can lead to excessive crankcase pressure resulting in leaky gaskets. If it's stuck open it can cause excess vacuum to the crankcase during deceleration ( I think that's when it happens) causing excessive oil consumption by way of oil vapors flowing through the intake. If I were you I would replace the PCV if it's never been done or it's been a while and pull the plugs to see what color they are. White or tan is normal, dry-black is rich, wet-black is severe oil consumption, grey fluffy deposits are the ones burning the oil quick enough to stay ahead of drowning in it! You can always do a compression or leak down test, but stick to the easy/cheap stuff for now.
Good luck, Bard