I started off running mine only on V-power then Nitro or whatever its called now, then out of necessity one day had to top up with Murco Super unleaded, after that I tried the BP ultimate, then Tesco Momentum &lastly Sainsbury's. I've not noticed any difference in performance, economy, engine noise etc. etc. between any of the fuels. Now I just fill up with whatever's nearest when I need it. Much easier than hunting down Shell stations!