Auto Sales & Rental KPIs: Gross Per Vehicle, Inventory Turn and Fleet Utilization
By PlainSight — Insightful Actions · Updated October 2026 · ~6 min read
A car lot and a rental fleet make money the same way underneath: a vehicle bought with borrowed money has to earn more than it costs to hold. On the sales side that means the profit on each deal and how fast the inventory turns. On the rental side it means how many days each car is out, what each day brings in, and what the car loses in value while it earns. These are the numbers to read every month.
Where your numbers live
Your dealer management system or rental software can export deals, repair orders and rental agreements to CSV or Excel: one row per deal or rental with the date, the type (new, used, rental, service, warranty), the source or customer, the location and the amount.
For gross and turn you also want each vehicle's cost and the date it came into stock; for rentals, the vehicle and the days out. Customer names aren't needed.
The numbers that decide what the inventory earns
1. Gross profit per vehicle, new and used
What good looks like: tracked separately for new and used, by salesperson and by lead source.
Front-end gross (sale price less vehicle cost and reconditioning) divided by units. Margins on new cars have been shrinking: in the Presidio Group and NCM Associates' report for the second quarter of 2026, average new-vehicle gross per unit was $1,840, down 13.5% from a year earlier, and used was $1,409. Watch your own trend, and read the deals at the bottom: a few cars sold at a loss usually explain most of a bad month.
2. F&I per vehicle retailed
What good looks like: steady or rising, without products customers cancel.
Finance and insurance income (the reserve on the loan, service contracts, GAP) divided by vehicles retailed. The same report put it at a record $1,769 per vehicle, more than the front-end gross on a used car. Track cancellations too: a product cancelled after the sale gives its income back.
3. Days in stock and aged inventory
What good looks like: used cars sold well inside 60 days, which many dealers set as their limit, and anything older repriced.
Count the days from the stock-in date to the sale date for every vehicle, and list what has sat longer than 60 days. A used car loses value every week it sits, and its floorplan interest keeps running. Wholesale values move too: the Manheim Used Vehicle Value Index was 206.2 in mid-September 2026, down 0.4% from a year earlier, its first year-over-year decline of 2026.
4. Floorplan cost per vehicle
What good looks like: known, and taken out of each car's gross before you call it profit.
Floorplan interest is charged every day on every financed vehicle. Multiply each car's days in stock by its daily interest and subtract it from the gross. A car that sold for a bigger gross after four months can earn less than one that sold for less in three weeks.
An example, to show the arithmetic (not a benchmark)
| Car A | Car B |
|---|
| Front-end gross | $1,500 | $900 |
|---|
| Days in stock | 120 | 21 |
|---|
| Floorplan interest (8% a year on $30,000) | $789 | $138 |
|---|
| Gross after floorplan | $711 | $762 |
|---|
5. Rental utilization
What good looks like: high and steady through the week, with the fleet sized to the days you can fill.
Days rented divided by days available, by vehicle class. Hertz reported 79% vehicle utilization for the second quarter of 2026. A small operator's figure will differ, but the arithmetic is the same: a car that sits three days a week still costs its whole payment, insurance and depreciation.
6. Revenue per rental day against depreciation
What good looks like: revenue per day well above what each car costs per day to own.
Divide rental revenue by days rented, then set it against what each car loses in value each month plus its financing and insurance. Hertz's net depreciation per unit was $302 a month in the second quarter of 2026. Buying the right cars at the right price and selling them at the right time decides a rental fleet's year as much as the rates do.
7. Service and warranty share
What good looks like: a service department that pays a large part of the fixed costs.
The share of gross profit that comes from service, parts and warranty work. Repair orders arrive whether or not cars are selling, which is why dealers measure how much of their overhead the service department covers (fixed absorption). Track it monthly; it is the cushion when sales slow.
Warning signs worth acting on
- Used cars past 90 days still priced like new arrivals — every week costs interest and value.
- Gross per unit falling while volume holds — you are buying the deals.
- Rental cars idle midweek while new ones are on order.
- F&I products cancelled soon after the sale — income that comes back out.
- One lead source supplying most of the deals.
Make it a weekly and monthly rhythm
Weekly for inventory: the aging list and the floorplan cost on it. Monthly for the rest: gross per unit, F&I, utilization, revenue per day and the service share. Act on the aging list first; it is the number that costs money every day you wait.
Let PlainSight read your deal and rental export
Upload a deal, repair-order or rental export and PlainSight breaks revenue down by type, source and location, shows what moved and where it is concentrated, and writes the next steps in plain English. Everything runs in your browser — your data never leaves your device.
See it on a live example →
Frequently asked questions
- What file does PlainSight need from a dealer or rental operator?
- An export with a date, the type of sale (new, used, rental, service, warranty), the source or customer, the location and the amount. Vehicle cost and stock-in dates add gross and turn; the vehicle and days out add rental utilization.
- Why track floorplan interest car by car?
- Because it is charged every day the car sits, and the deal report usually doesn't show it. Two cars with the same gross can earn very different amounts once their days in stock are counted.
- What is a good utilization rate for a small rental fleet?
- There is no single figure; it depends on your market and season. The large public fleets report theirs (Hertz ran 79% in the second quarter of 2026). Compare yourself with your own last year, month by month, and size the fleet to the days you can fill.
- Is my data safe if I use PlainSight?
- Yes. Files are processed entirely in your browser and never uploaded. Optional AI features send only anonymized summary totals, never names or raw rows.
Sources
This guide is general information for dealers and rental operators, not financial, tax, or legal advice. Figures described as “typical” or “common” are survey results and rules of thumb, not standards — always read your own numbers in context.