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[aaronjb]

When I got bored on the Motorways in the past, I did some Speed vs Revs test on Calibrated Plods (had a few now) and Standard Migs with the same Engine / Diff Ratios, it became a fairly consistent that, working the figures backwards that a typical 3.0 / 3.2 standard Speedo at 70 mph as pretty much bang on 66.5 mph on the Calibrated Plod, so standard seems to read about 3.5 mph high at 70.

so guessing 63 wouln't be that far out for a true 60, if all that makes sense. 

Yeah, but when accelerating (certainly the non calibrated) are slightly damped, if that makes sense?

Yea, it does, suppose I could always tow Webby with a Bungee Rope behind a 3.2 Manual and see how long it takes him to hit me in the rear at 60. 

Webby doesn't do 60, bit too scary

I thought of his comment about that as I nailed it up the A322 the other night..

[cem_devecioglu]

When I got bored on the Motorways in the past, I did some Speed vs Revs test on Calibrated Plods (had a few now) and Standard Migs with the same Engine / Diff Ratios, it became a fairly consistent that, working the figures backwards that a typical 3.0 / 3.2 standard Speedo at 70 mph as pretty much bang on 66.5 mph on the Calibrated Plod, so standard seems to read about 3.5 mph high at 70.

so guessing 63 wouln't be that far out for a true 60, if all that makes sense. 

Yeah, but when accelerating (certainly the non calibrated) are slightly damped, if that makes sense?

Yea, it does, suppose I could always tow Webby with a Bungee Rope behind a 3.2 Manual and see how long it takes him to hit me in the rear at 60.