Jimm 2/3/2013First question - how many miles on the engine? Second, about how many miles are driven between adding the oil? Are these mostly highway or city (stop and go) miles? Third, are you certain the oil is 'burning' and not leaking from the engine at some point?
Depending on the age and mileage / condition of the engine - using one quart every 6 weeks may not be considered excessive. You should really measure in miles driven rather than time, however.