Not a conspiracy.

Cars are tested from manufacturers and manufacturers are fined very heavily if the speedos on their cars show anything *under* the correct speed of the vehicle. Car makers deliberately make the speedos 10% higher than actual speed so as to avoid these sorts of situations.

On my car - 155mpg is actually about 145. Top on the speedo is 170 which is about 160.

HTH

Cheers,

Paul.
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Paul Haigh, Reg. 4120 (mk1) 6GB, Blue, 00254 (mk2) 12GB, Red, 00357