I have had my 53 plate IS for a couple of months and always used norm unleaded but are the claims of BP Ultimate ect valid.
Ie, do you get more mpg and is it better for the engine.
I have also read that if you change to higher octane fuels you need to reset the ECU, as I do not fancy messing with the electronics will I gain anything just by pouring the stuff in.
Just another question, when driving the other day I was hit with 2 beeps from somewhere, no warning lights came on and has not done it since. Anything to worry about or not.