Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
Supprised you didn't chime in on this one Ash, thought it would be right up your street. Was looking forward to learning something about the subject.
Regarding running on "BP ultimate",,I restored & owned a TR 4 and always used ultimate fuel ,founding that it performed with a better MPG and ran a lot better,so being ,have since used it in my bikes, also which brings the tickover a lot lower & smoother on my 550 , being more expensive to buy in the first place , I think you reap it back with a better MPG......