After 1.80 theme update decimals and thousand separator are managed from theme options
For older versions
To remove decimals from measurement units must change number format for size value to not include decimals.
Help for number format issue: http://php.net/manual/en/function.number-format.php
Screenshot with the place where must change it
Original code with 2 decimals
Modified code with 0 decimals
Change thousand separator, ex “1,248” instead of “1 248” , apply the thousand separator in the code