Right my car has been in it's current state of 'tune' for about 12 months. (Standard+VeccyC+K&N)
In Dec I ran on Thorney's RR and got: 130.8bhp @ 5460rpm & 140lb/ft @ 3500rpm on Tesco 99.
Yesterday ran on Marlins and got: 135.6bhp @ 5835rpm & 132lb/ft @ 4800rpm on BP Ultimate 97.
The only thing that has changed is that I have a shiny new battery. I know that different RR give different results but surely if torque goes up so should bhp?!? Could the different fuel really make this difference??