Im new to Audi's and currently have a 2000 S3. The previous owner spent 1000's on her keeping her healthy. Anyway he spent £1800 at Demon Tweeks on a Milltek Cat Back, Milltek Hiflow CAT, K&N induction, and Superchips Remap. Not sure on what's it producing but think its over 250bhp mark.
Anyway, I find no different in performance or mpg when filling up with either Unleaded/Superleaded. I always use Shell Vpower but recently put normal fuelsave in and no difference. If anything fuelsave is better on mpg. I always thought and read that remapped carsrun better on Super and usually remapped to either Ron97/99.
Would you continue to use fuelsave and save yourself 5p/litre for basically the same product.