Hi, I have had my S3 for a little over 18 Months in that time I have had it serviced twice, both times at the same Audi Dealer. After the first service I very shortly went to the Ring. After this time the fuel consumption droped (I measured this in two ways, DIS dropped from around 28-29 ave to 24-25(not including the fuel used at the ring - b4 anybody asks;-) ), however more importantly miles per tank dropped from around 300ish to 250ish). I thought may be it was the engine management "learning" to allow more fuel 'cause I drive it harder -dumb yes I know. However I have just had the thing serviced again and yet another trip to the ring and now the fuel consumption is actually better than before (returning 325miles to a tank with 25 miles range left). It's never been that good, motorway miles or not. So my instinct tells me Audi **cked up in the previous service. My question is what could they have done to have this effect, I want some opinions as I feel like I should complain. I could argue that whatever they did has cost me more than the price of the service - just want to know if they could have done something to cause this?????