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I wisj I'd joined this post when it was still talking about speeds instead of a hooooge slanging match, still hey ho.
All this talk of speedo inaccuracy, I think my speedo must be fairly accurate as I'd say on the day I gave it a good speed run I was doing 120 (give or take 1 or 2) and funnily enough 120 is the same number the nice uniformed officer in the volvo had on his fancy measuring gun !