
Are you anti-European and anti SI?
11,190 km/s is European format for what the British or Americans would write as 11,190 m/s or 11.190 km/s
It's all in the comma / dot difference between European and British / American number usage.
Also 11,190 km/s is good SI usage, 11,190 m/s is not.
The k M G etc prefixes are used to make the numerical value fall in the range 0 to 999