Alfa 159 SW 1.9 vs 2.4 JTDM

Hello dear Alfa friends, I need your experience. I would like to exchange my gasoline A4 FSI for an Alfa 159 JTDM and also have interesting offers. Unfortunately there is a problem here, in general I am looking for a economical car, but now it comes, I drove the 2.4 and already quite enthusiastic. Short to the details, the offers look as follows: 1.9 Dist. with leather, Xenon, BlueMe, PDC rear, rain and light sensor, CD radio, shared back bench (hopeful This is a new car 2.4 of the same equipment as above, however, just with the big machine and in addition still Navi and (which I don’t really need) ele. Sitting, this car has already 19tkm on the speedometer and is a demonstration car. I just can’t decide. My claim is definitely to drive this car long (up to min. 200tkm). To which would you advise me? Both cars cost equally much, only one is new, the I think a decisive factor is consumption, but I couldn’t find much in comparison, maybe you can help me!? Thank you in advance.