Since buying my car at the end of November I've always given it Shell V Power, there are two near my house so there's no excuse really, but last night all the VP pumps were off so I only put Â£10 of normal Shell in - I always fill it right up every time with VP - and the temperatures outside were 3C down to 1C where I ended up. Now then, having been driving spiritedly before the fill up and then afterwards, it seemed pokier with the cheaper fuel in it. Having never owned a turbo car before I want to give it the best diet of fuel but this has made me think twice. I'm not so fussed about VP costing a little more if it's going to create 'better' bangs from running higher octane but there was a marked increase in it gobbling the revs towards the upper regions of the rev range. I doubt it's **** at the bottom of the tank as I don't let it get lower than 40 miles left and the slight change in ambient temps. Any ideas or am I making it up?