Two dealers each have $300,000 in inventory. Dealer A averages $1,800 front gross and turns his inventory six times a year. Dealer B averages $1,400 — "worse" — but turns twelve times. Run the math: A grosses about $270,000 a year on that capital (assuming ~$12k average cost, ~25 units, 150 sales); B grosses about $420,000 on the same capital. Dealer B wins by a mile while looking softer on every individual deal. That's the whole argument: in the used car business, return on capital is gross per unit times turn, and turn is the multiplier most dealers ignore.
How to compute it (three ways, pick one and stick with it)
- Annualized turn: retail units sold per year ÷ average units in stock. Sell 180 a year with 20 on the lot on average = 9x turn.
- Days supply: current units in stock ÷ average daily sales rate (use trailing 45–90 days). 24 units in stock, selling 0.8/day = 30 days supply.
- Average days-in-stock of sold units: for each sale, days from purchase (not front-line date — purchase, so recon lag can't hide) to sale, averaged monthly. This one exposes problems fastest.
Benchmarks, honestly: many independents run 6–8 turns (45–60 day average). Sharp operators run 10–13 (under 35 days). The velocity-focused crowd pushes past that. Where you should be depends on segment — cheap commuter cars should fly; specialty inventory legitimately sits longer — but every store should know its number monthly and its trend quarterly.
Why turn compounds beyond the obvious
- Depreciation is a tax on holding. Used cars lose value monthly whether you sell them or not — figure roughly 1–2% of value a month in normal markets, worse in declining ones. A 90-day unit has quietly donated hundreds of dollars before you touch the price.
- Carry costs accrue daily. Floor plan interest, insurance, lot space, curtailment cash. A floored $12,000 unit can cost $3–$6+ a day just existing.
- Fresh inventory sells itself. Units get their most views, calls and best offers in their first two weeks online. The longer a car sits, the staler it looks to the market — shoppers and their tools can see days-listed, and they price your desperation in.
- Fast turn means fast learning. Twelve turns a year gives you twelve cycles of feedback on what your market wants. Slow-turn dealers are always trading on last year's information.
The levers, in order of impact
1. Buy right — turn is mostly decided at purchase
Aged units are almost always bought wrong: wrong car for the market, or right car at a price that forced an uncompetitive ask. Build the buy around retail-back math (target sale price minus recon, fees, pack and target gross = max buy) and around demand evidence — what actually sells in your market in under 30 days — not around what you like driving.
2. Compress recon days ruthlessly
Every day between purchase and front-line-ready is pure aging with zero sales exposure. Track days-to-frontline as its own metric; sharp stores get units photographed, priced and live within 3–5 days of arrival. If your recon takes two weeks, you've spent half your freshest, highest-demand window invisible.
3. Price to the market from day one, and re-price on a calendar
The classic aging pattern: price high "to leave room," ignore it for six weeks, then chase the market down with late, panicky cuts. Velocity discipline is the opposite — competitive from day one, then scheduled reviews (many stores re-price weekly and act at 30/45/60 day triggers) with pre-committed actions at each age band. Decide the exit rule in advance: at 60 or 75 days the unit gets priced to move or goes to the auction, no seller's ego vote.
4. Merchandise like the first week matters — because it's everything
Full photos, honest description and correct pricing on day one, not trickling in over a week. A unit listed with two photos and "call for price" during its highest-attention window is a wasted honeymoon.
5. Watch segment-level days supply
Turn problems hide in averages. Run days supply by segment: you may be at 25 days on SUVs and 80 on sedans, which means you're overbought in sedans no matter how healthy the blended number looks. Buy toward the segments that are moving.
The management rhythm
Weekly: aged-unit review — every car over 45 days gets a decision (re-price, re-photo, re-position, wholesale), owner or manager present, no unit skipped. Monthly: turn, days-to-frontline and gross-per-unit-per-turn reviewed together, because the goal was never turn alone — it's total gross per dollar of inventory per year. Chasing turn by giving cars away is as wrong as chasing gross by letting them age. The stores that win hold both numbers in view and let the capital math, not the trophy deal, run the lot.
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