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That article completely bears out my experiments and I certainly don't care if I sell my dealer a car with a dirty engine.
I had to smile at the BP tests: they used a Mitsubishi Evo 9 3/4 (I can't remember the version) taken to 7000rpm in the gears.
So driving like that gives us greatest benefit, however it increases our fuel consumption by about 20% average, reduces engine life likewise and increases pollution of the environment.
So Tesco's 95 for me.
Tony
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