Most dealerships measure plenty. Few measure the right things, in the right combination, often enough to act on. The result is a monthly report that explains what already happened instead of a live dashboard that changes what happens next.

Good dealership KPIs do three things: they tell you where money is being made and lost, they warn you early enough to act, and they connect - so you can see the trade-offs between selling fast and selling well.

Here are fifteen metrics every used car manager should track, grouped by what they tell you, with plain definitions, rough benchmarks, and how to read them together. Treat the benchmarks as representative ranges, not gospel - your numbers depend on your franchise, market, and price point.

Inventory KPIs: is your stock working?

1. Days-to-sell (average days in stock)

The average number of days a car sits before it sells. The single most important used-car health metric, because nearly every other cost scales with it.

A common ambition is an average in the 30 to 45 day range, with the real battle being the tail - the cars past 60 and 90 days. Watch the distribution, not just the average; one good number can hide a pile of stale metal.

2. Stock turn (inventory turnover)

How many times you sell and replace your stock over a year. If you hold 100 cars on average and sell 800, that's a stock turn of 8.

Higher turn means your capital is working harder. Many used operations target somewhere around 8 to 12 turns a year. Turn and days-to-sell are two views of the same thing - faster selling means more turns from the same capital.

3. Aged stock percentage

The share of your stock past a defined age threshold, typically 60 or 90 days. This is your early-warning gauge for trapped cash and future markdowns. Keep it low and falling. A rising aged-stock percentage is the first sign that buying or pricing has drifted out of step with demand.

4. Stock-to-sales ratio

How much stock you're holding relative to how fast it's selling. Too high and you're overstocked, paying to hold cars you can't turn. Too low and you're missing sales because the right cars aren't on the forecourt. The goal is balance - enough choice to sell, not so much that capital sits idle.

5. Days' supply

How many days your current stock would last at your current sales rate. A practical, forward-looking read on whether you're carrying too much or too little. Useful for catching overstocking before it shows up as aged cars.

Profitability KPIs: is the money real?

6. Gross profit per unit (GPU)

Average gross profit per car sold, front-end and total. The headline profitability number. But read it alongside days-to-sell - a high GPU on cars that take 90 days to sell can be worth less than a lower GPU on cars that turn in three weeks, once holding costs eat in.

7. Margin-at-risk

The profit you stand to lose on current stock if it doesn't sell soon - the gap between each car's likely standing value and your total cost in it, including reconditioning and holding cost. Unlike GPU, which looks backward at sold cars, margin-at-risk looks forward at the cars you still own. It tells you where to act today.

8. Total gross profit and blended margin

Your overall gross across all used sales and the blended margin percentage. The whole-of-business view that stops you over-celebrating a few fat deals while the average quietly erodes.

9. Front-end vs back-end gross split

How much profit comes from the car itself versus finance, insurance, warranty, and add-ons. Many healthy used operations make a meaningful share of total gross on the back end. If your front-end margins are thin, a strong back end is what keeps the business profitable - so measure it deliberately.

10. Cost of holding (per car, per day)

The daily cost of keeping a car: floor plan interest, depreciation, insurance, overhead. Most managers underestimate it. Putting a real per-day number on it transforms how urgently aged stock gets treated - because now you can see exactly what waiting costs.

Sales and process KPIs: is the funnel working?

11. Lead-to-sale conversion

The percentage of leads or enquiries that become sales. The cleanest read on sales-process effectiveness. A dip here can wipe out good stocking and pricing work - if buyers are interested but not converting, the problem is in the handling, not the metal.

12. Lead response time

How fast enquiries get a real, useful first response. Speed strongly influences conversion; the first dealer to respond well often wins the deal. Measure it in minutes, not "same day."

13. Test-drive and appointment rate

The share of leads that turn into a test drive or showroom appointment. The bridge between enquiry and sale. If conversion is weak, this metric tells you whether the problem is getting people in (top of funnel) or closing them once they're there (bottom).

14. Reconditioning cycle time

Days from acquiring a car to it being retail-ready and advertised. Every day here is a day of holding cost before the car can even start selling - and it silently inflates days-to-sell. Tightening recon cycle time is one of the most overlooked levers in used-car profit.

15. Sales per salesperson (productivity)

Units and gross per salesperson over a period. Shows where coaching, workload balancing, or process help is needed - and protects against judging the team on a single big month rather than consistent performance.

The cardinal rule: never optimise one KPI alone

This is where most KPI programmes go wrong. A single metric, pushed in isolation, almost always breaks another.

  • Chase days-to-sell alone and you'll discount everything to move it fast - turn looks great, GPU collapses.
  • Chase GPU alone and you'll hold out for top dollar - margin looks great, days-to-sell and aged stock balloon.
  • Chase stock turn alone and you might under-stock, missing sales and starving the back end.
  • Chase lead volume alone while ignoring conversion and response time and you'll pay for traffic that never closes.

KPIs are a system. The skill is reading them together: days-to-sell against GPU, stock turn against stock-to-sales, conversion against response time. The best used-car managers don't maximise any one number - they tune the balance.

Live beats monthly, every time

The other failure is timing. A KPI you see once a month is a history lesson. By the time the report lands, the aged car is already aged, the margin is already lost, the slow lead is already cold.

The metrics that drive action - days-to-sell, margin-at-risk, aged stock, response time - are only useful if they're current. The reason most dealers run them monthly isn't lack of will. It's that the data lives in different places: stock in the DMS, leads in a CRM, pricing on marketplaces, recon on a whiteboard. Stitching it together by hand is a monthly job, so it happens monthly.

When those sources feed one live layer, the same KPIs become a daily instrument: the car tracking behind its days-to-sell gets flagged at day 20, the margin-at-risk car surfaces before it goes underwater, the slow-responding lead gets caught while it's still warm. Same metrics. Completely different value.

You don't need fifteen new tools to track fifteen KPIs. You need one place where your stock, sales, pricing, and process data live together and stay current.

That's the layer VehIQ is building. By unifying vehicle and dealership data - with canonical records, days-to-sell estimates, and margin-at-risk built in - it turns the metrics in this list from a monthly post-mortem into a live read on the business, running alongside the systems you already use. The KPIs don't change. How fast you can act on them does.