This new tune comparison video is interesting. Note lots of rural USA only have 91 octane fuel which is equivalent to our 95 RON fuel. This test is done using the lower octane version of the tunes and using the low torque versions of each companies tune.

This same guy is soon going to do the same test with the higher octane version of the tunes (95RON which is equivalent to our 98 RON premium unleaded fuel) so it will be interesting to see the difference in power between the different fuel, where they can push timing and boost more with the better quality fuel.