You likely get 10 (km/h or mph) on the interstate or motorway, what’s the problem. I can understand and agree with a desire for precision, but be practical.
Inbound to MDW, behind the ever-speeding Southwest B737, ATC asked my speed, “250 knots” which is exactly what was assigned and indicated. Southwest, “what’s your speed?”; “250 knots”. ORD; “Southwest, pick it up, your 250 knots is slower than the guy behind you”. Classic.