We are fortunate down here and have lots of choices I run 100 Octane Shell V Racing from the pump around A$1.70 a litre then I put 500 Mil of Nulon octane boost which gives me an average of 105octane for the track

The Powerchip ECU I had made is set for 100octane makes a huge difference runs with the SRT until around 120/130Klms then not much in it anyway. Howver the Limted is heavily modified