I've had a fairly large focus on fuels lately and it seems to me that issues come about not because of brands, but because of the servos they come from. I use V-Power when I'm at home as BP or Caltex don't have anything good here and up until now, it's been ok. Now that the ambient temps are coming up, the actual quality of the fuel is starting to shine through. Detonation has been hard to dodge, so I've had to resort to running a good octane booster in each tank to prevent this. Now, when I hit Townsville, I usually use the Vortex 98 from the same busy servo and it has been good. Last time however I went to a busy BP down the road a bit and started using Ultimate. It does run a little better, can't tell much difference power-wise, but it allows me to sink the boot without rattling itself to death. Talking to people in the know, the aromatics boil off premium fuels within 2 weeks, so find a busy servo and stick to it. Also, don't leave it sitting in your tank.