As the thread states I want to know from previous or current B7 RS4 Avant owners the running costs of the said car. I am about to increase the size of the Brodie family (no not a baby) and think the S3 is slightly too small. I was looking at the RS3 but dont wanna blow all my money on one car. I have had a look at the B7 RS4 and love it and a good one can be had for as little as 20k with FSH and fully loaded (07 to 08 plate) Theres lots on Pistonheads and my mate is looking out for one in the Audi garage. Any comments are greatly appreciated. Include things such as fuel, tax, servicing etc etc. I just want a good insight into how much it will cost me compared to the S3.