Re: best petrol to use??
Mobil Synergy 8000, Shell Optimax, and BP Ultimate are all 98 RON, and are the best of the bunch.
Caltex Vortex is only 95 RON, so really isn't in the running.
I mainly use BP Ultimate, though I can't say I notice a difference from any of the above 3.
It does detonate on Vortex and anything below that however.
4L I6, naturally aspirated producing 173.5rwkw.
14.410 @ 96.49mph with street radials.
What's that?..... Did I hear you say TQE power?