Re: What speed was i doing????
What's the top speed in 5th at the rev limit with standard wheel / tyre combo? No matter what mods he's done, if he hasn't changed the gearbox or limiter, if he's running standard wheels and tyres he can't go above that. It's a 19% increase over what you'd expect, which is pretty unusual. I suppose a 7inch difference in the circumference could change the gearing enough to do that.
As for sat nav being accurate, I can only speak for mine, and whilst it's generally accurate, it has been known to give slightly mad readings, albeit when I'm stuck in traffic and it shows me as still doing 20mph.