Financial research concept

Used Auto Comparable Store Unit Sales Growth

Used auto comparable store unit sales growth measures the change in retail used-vehicle units sold by stores included in both comparison periods.

By Lee BaileyPublished Sep 25, 2026

Research context

See what supports this page, how current it is, and where comparable or historical context is available.

Research date: Sep 25, 2026Use the dated article and cited sources for the definition, examples, and stated limitations.
Operating-model context: 23 connected conceptsPart of the reviewed Used Auto Retail & Finance Economics; issuer definitions remain distinct where disclosed.
Company examples: 1 reviewed companyRelationships reflect supported examples, not a normalized cross-company KPI ranking.

CarMax example
Why it matters
Units versus revenue
Part of the Used Auto Retail & Finance Economics
See It in Company Research
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Used auto comparable store unit sales growth measures the change in retail used-vehicle units sold by the mature store base included in both the current and prior comparison periods.

It separates performance at existing locations from growth created by new stores.

CarMax example

CarMax reported a 2.0% decline in comparable-store used vehicle units for fiscal 2026.

Its comparable-store base includes stores beginning in their fourteenth full month of operation, and the calculation compares a consistent store set across periods.

Why it matters

Total Used Auto Retail Unit Sales can grow because the company opens locations even when mature-store demand weakens.

Comparable-store unit growth helps isolate demand and execution within the existing footprint.

Units versus revenue

Comparable-store unit growth should not be confused with comparable-store revenue growth. Average selling price and mix can make revenue move differently from units.

For CarMax in fiscal 2026, comparable-store used vehicle revenue declined 2.5%, slightly more than the 2.0% decline in units.

Primary source: CarMax fiscal 2026 Form 10-K.

The metric is most useful with store openings, average selling price, gross profit per unit, and digital demand.

Part of the Used Auto Retail & Finance Economics

Connect used-vehicle demand, pricing, sourcing, digital transaction mix, wholesale disposition, operating leverage, finance penetration, lending spread, and credit performance across an integrated used-auto retailer.

Browse the full operating model in Company Analysis →

Where this concept fits

Retail volume, pricing, margin, and operating leverageCurrent relationship
Retail unit sales and comparable-store unit growth show demand, average selling price shows transaction value, used-vehicle gross profit per unit shows front-end merchandising margin, and SG&A per total unit plus SG&A as a percent of gross profit show how transaction economics convert through the retailer's overhead base.
Used Auto Comparable Store Unit Sales GrowthCurrent conceptUsed Auto Retail Average Selling Price Used Auto Retail Unit Sales Used Auto SG&A as a Percent of Gross Profit Used Auto SG&A per Total Unit Used-Vehicle Gross Profit per Unit
Sourcing, digital channel mix, and wholesale disposition
Vehicle purchases from consumers and dealers show inventory sourcing, digitally enabled, omni, and online sales rates show how customers move through the transaction funnel, extended protection plan revenue adds attached-product economics, and wholesale units, selling price, and gross profit per unit show the disposition path for vehicles sold to dealers.
Digitally Enabled Transaction Rate Extended Protection Plan Revenue Used Auto Omni Sales Rate Used Auto Online Retail Sales Rate Vehicle Purchases from Consumers Vehicle Purchases from Dealers Used Auto Wholesale Average Selling Price Used Auto Wholesale Gross Profit per Unit Used Auto Wholesale Unit Sales
Finance origination, spread, and credit performance
Net finance penetration and net auto loans originated show how retail sales feed the lending book, interest margin and its rate show lending spread economics, finance income shows the resulting segment contribution after included credit and direct costs, and past-due, net credit loss, and recovery rates show portfolio performance and loss severity.
Auto Finance Average Recovery Rate Auto Finance Income Auto Finance Interest Margin Auto Finance Interest Margin Rate Net Auto Loans Originated Auto Finance Net Credit Loss Rate Auto Finance Net Penetration Rate Auto Finance Past-Due Account Rate

See It in Company Research

These companies are examples of how the concept is reported or discussed in public filings. Definitions can differ by issuer; these links open company research rather than a normalized metric comparison.

KMXOpen operating-model research →23 of 23 reviewed concepts in Used Auto Retail & Finance EconomicsRetail volume, pricing, margin, and operating leverage6 of 6 bridge concepts supportedContinue through this bridge:Used Auto Retail Average Selling Price Used Auto Retail Unit Sales Used Auto SG&A as a Percent of Gross Profit Used Auto SG&A per Total Unit Used-Vehicle Gross Profit per Unit

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