I've been running mine on Shell unleaded 95 RON at the moment, but I was using Optimax when it was 98 RON, but I've not put any V-Power in as that's 99 RON and as I'm running K-jet I'm not sure if it will run ok or not as there's no ECU. I was always advised that it's best to run mk1 k-jets on at least 97 RON, so put in either normal unleaded or one of the 97's from various garages.