Figures on your old RS4 look very good, was that based on the DIS? as sounds a tad high if your commuting. When I do similar in the 4.2 S8 I get around 16mpg and in the 5.0 RS6 around 12mpg. However when I get out on the wide open A82 to Glencoe though I probably get about 10 and 6 from them...
As someone on here once said "buying cars like these and worrying about fuel consumption is a bit like buying a boat and worrying about it getting wet"...best enjoy I think
