Subaru's with underestimating speedos

THE discrepancy relating to the new Subaru Forester (Carsguide, December 12) also applies to the current model 3.6R Tribeca. My vehicle's speedo is understated by 8km/h. The 10 per cent allowable tolerance is not a sufficient reason for Subaru to ignore this issue. If the vehicle is doing 92km/h hour when the speedo shows 100km/h, does the discrepancy stay constant? This discrepancy would also distort the fuel consumption claimed by Subaru to be 11.6 litres for 100km.