Omega B FL 2.5 2.6 or 3.0 ?

Hello, I would like to buy now an Omega B limousine. Should absolutely be a hand switch and Facelift. Thus the 3.2er falls away already, because it only exists with Opamatic. It should be a V6. Now I have read that the new V6 2.6 and 3,2 pull a good sip more out of the tank. Does someone experience with both engines ? Does the 3.0 (old) consume more than the 2.6 (new) or are about the same. Then I would look for the 3.0er with 211 HP especially because the insurance and repair costs are almost the same. I am a rather quiet driver who wants to go up early, but also sometimes on long distances comfortably with 160 km/h travel. (I know, to this also the 2.2er, but I want to know that I could if I wanted !) Greeting Astra 66