Hi all since i sold my v6 vectra the money is burning a hole in my wallet and need to buy somthing fast before i end up spending it

I am wanting a 2.2 dti BUT the price to buy one at the moment is shocking so ive been looking at the 3.2s and want to know will they drink fuel like there is no tomorrow etc ? I keep telling the wife i carnt see it useing much more than the vectra am i right in saying this ??