MPI Completion Rate: The Number Behind Your Low ARO

If you've read about raising Average Repair Order, you've probably seen the advice to "do a thorough inspection on every car." MPI completion rate is what turns that advice into something you can actually measure instead of just hope is happening.

The Formula

MPI Completion Rate = Repair Orders With a Completed Inspection ÷ Total Repair Orders × 100

Straightforward to calculate, and often uncomfortable to look at honestly the first time — most shops assume it's higher than it actually is.

Why This Is the Number Behind a Low ARO

ARO measures what you sold. MPI completion rate measures whether you even looked for something to sell in the first place. A shop with a low ARO and a low MPI completion rate doesn't have a sales problem — it has a "we're not finding the work" problem, and no amount of training your service advisor to sell harder fixes a gap that starts with the inspection never happening.

Why It Slips

• Time pressure on "quick" jobs. An oil change or tire rotation gets treated as too simple to warrant a full inspection, even though it's often the easiest moment to catch something else.
• No consistent inspection process. Without a standard form or checklist, "inspection" means something different depending on which tech is doing it.
• No accountability tracking. If nobody's looking at completion rate by tech, there's no signal that it's slipping until ARO drops months later and the cause isn't obvious.
• Treated as optional rather than standard. On a busy day, the inspection is the first thing that quietly gets skipped.

What Improves It

1. Make it a required step on every RO, not just the ones that seem to warrant it — the jobs that seem too simple to inspect are often exactly where something gets missed.
2. Use a consistent checklist, not a mental one that varies by technician.
3. Track completion by tech, the same way you'd track any other performance metric — not to punish, but to see where the habit needs reinforcing.
4. Document what's found, not just that it was checked. A completed inspection with nothing written down doesn't give your service advisor anything to present to the customer.

MPI completion rate is one of the easiest KPIs to let slide because nothing dramatic happens the day it drops — the effect shows up weeks later in a lower ARO, disconnected enough in time that it's easy to miss the actual cause.