Hi all,
I had a Passat 130tdi sport [2001] a couple of years ago and it was an excellent car both solo and towing, 52mpg solo, 27mpg towing at 60mph and 37mpg towing at 50mph.[Caravan was 1400kgs]
The Skoda is a Passat with a longer wheelbase, which can only make it more stable when towing, the badge is not as good but the price and spec is better and cannot be ignored.
Also a 2.5v6 tdi is available in the Superb, I had a 2.5 in an Audi A4, loads of power, very smooth but only around 40mpg solo and mid 20s towing, mine was a 180bhp quattro which was over 1600kgs so the 2wd Skoda fitted with the 163bhp version may be a bit more economical, but after owning both, based on costs the 1.9tdi 130 would still be my choice due to the excellent all round economy even though the Audi was a bit more fun to drive but I did pay for it with the fuel costs.