Volvo model change from XC 90 to Xc 70

Hello, have to replace my one year old XC 90 (leasing) prematurely, since I do not get along with the km (contract with 25.000km/YAhr) driving at present well 30-25000 in the JAhr I have before to replace prematurely. Alone the diesel consumption of my Xc 90 at 12-13 liters to 8 liters of an Xc 70 are a lot € which I save. Would you exchange the Xc 90 for a new Xc 70 (previous model edition) with very good equipment or prefer to choose the completely new Xc 70 ????, With the new Xc 70 in m a confiscation will become less expensive ??