awk '{printf "%.2f %.2f\n", $4 / 1024, $6 / 1024 }'
will print kilobytes with two decimal points.
$ line="Average: en0 1 68 2 132"
$ echo "$line" | awk '{printf "%.2f %.2f\n", $4 / 1024, $6 / 1024 }'
0.07 0.13