But for now the 3.2 is our family car
As we've said time and time again, though, despite the fuel consumption:
it's comfortable
It's capable
It's roomy, with plenty of room for adults in the back
It's cheap to run (fuel aside), service, insure and tax
I'd rather be in an Omega that a lot of other cars in a pile up
Its an easy, effortless drive that can crunch miles easily and comfortably, even with 4 adults and luggage in.
Or buy something similar for £10k for a 10yr old model, that at best will be equal to it, maybe better on fuel if you plump for diesel. £10k is a lot of fuel - lets say a replacement is a third better on fuel, you'd have to burn through £30k of fuel to break even purely on fuel, before you even take into account the savings the Omega has with servicing, tax etc etc.
No brainer, really, from a purely financial point of view (and ignoring desires, little wanters, and keeping up with the Jones' etc)