My present Omega is my third, and I have stuck with it because it is simply such a brilliant towcar, as well as a comfortable general vehicle. Prior to this we always towed with Volvos (240 and 740). I have had a 2 litre, a 2.3 litre, and currently a 2.6 litre, all petrol engines, all automatics. Of the three, the 2.3 was my favourite, but that was written off when someone ran into the back of it in fog. My current vehicle now has 105K on the clock, but went through an MOT recently without a problem.
The Omega is not the most economical car on the road, but on the other hand, they are available at bargain prices, so what you save on the cost of the car, you can put towards fuel.