Two of the most reliable savings — quoting time and ISO audit prep — costed on your figures, with conservative assumptions you can see and change. No invented averages.
A back-of-envelope on two clear, time-based savings — it ignores the harder-to-pin gains (jobs you'd have lost money on, chasing that doesn't happen, late deliveries avoided), so if anything it's an under-count. The real number is the one you'll see in a demo on your own jobs.