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From the tests undertaken of fuel RON and comparing the supermarket forecourts with the big brand 'special' fuels (BP & Shell primarily), typically the result was that scientifically speaking, the fancy stuff was better, and had numerical evidence to prove it - but the key point was that was as the result of almost forensic analysis.
In the real world, during daily driving, the benefits are rarely noticeable (at least in so much as whatever it promises you in performance or increased mpg, is difficult to show). This appeared to be the case for both petrol and diesel fuels.
I use 99 RON from Tesco, or Shell VPower, but purely because the Golf R requires min 98 RON. From memory, VPower Nitro unleaded is 100 RON, and doesn't contain the ethanol that Tesco 99 does (it's basically 97 RON with ethanol added to bump the octane up).
As a side note, I remember watching an interesting Shell experiment where Ferrari tanked up one of the late V8 F1 cars with VPower to compare it with their race fuel. Aside from needing to run a little less ignition lead, it made nearly as much power through most of the rev range, and more power in a few places. |
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