Financial research concept

Auto Dealer Same-Store Basis

holds a dealership cohort relatively constant so investors can separate operating changes from acquisitions, divestitures, and newly opened stores.

By Lee BaileyPublished Sep 28, 2026

Research context

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

Research date: Sep 28, 2026Use the dated article and cited sources for the definition, examples, and stated limitations.
Operating-model context: 10 connected conceptsPart of the reviewed Automotive Dealership Economics; issuer definitions remain distinct where disclosed.
Company examples: 3 reviewed companiesRelationships reflect supported examples, not a normalized cross-company KPI ranking.

Acquisitions can hide the operating trend
The definition travels with the issuer
Part of the Automotive Dealership Economics
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An auto dealer same-store basis compares dealership results using a relatively stable store cohort rather than letting acquisitions, divestitures, or new locations dominate the year-over-year change.

That distinction matters because buying and selling dealerships is part of the business model. AutoNation says the gap between reported and same-store revenue and gross profit reflects acquisition and divestiture activity plus openings of AutoNation USA used-vehicle stores. Penske and Sonic also reconcile reported results to same-store populations, but their inclusion rules are issuer-specific.

Acquisitions can hide the operating trend

Reported growth answers what happened to the consolidated company. Same-store growth asks whether the legacy footprint actually improved. A dealer group can grow reported revenue after buying stores even while the existing locations sell fewer vehicles.

The same boundary should carry into per-unit measures. AutoNation's 2025 same-store new-vehicle revenue per retail unit was $52,097, while Penske reported $59,114 on its own same-store basis. Those figures are useful inside each issuer's framework, but the cohort rules are not automatically identical.

The definition travels with the issuer

A store may enter the comparable base after a specified ownership period, and acquisitions, dispositions, open points, geography, agency sales, or dedicated used-car stores can receive different treatment. Sonic, for example, describes currently operating stores entering its same-store group after the first full month following the first anniversary of opening or acquisition.

For investors, same-store treatment is therefore a comparison method, not a standardized accounting measure. Read the cohort rule before comparing gross profit per retail unit, fixed operations, or F&I across companies.

Primary sources: AutoNation 2025 Form 10-K, Penske Automotive Group 2025 Form 10-K, and Sonic Automotive 2025 Form 10-K.

Part of the Automotive Dealership Economics

Connect same-store normalization, vehicle transaction value and front-end gross profit, back-end F&I and fixed operations, inventory pressure, profit mix, and overhead conversion across franchised automotive retailers.

Browse the full operating model in Company Analysis →

Where this concept fits

Same-store vehicle transaction and front-end economicsCurrent relationship
Same-store cohort rules separate organic operations from portfolio changes. New and used revenue per retail unit show transaction value, while the corresponding gross-profit PVR measures show the front-end spread retained from those sales.
New-Vehicle Gross Profit per Unit New-Vehicle Revenue per UnitDealer Same-Store BasisCurrent conceptUsed-Vehicle Gross Profit per Unit Used-Vehicle Revenue per Unit
Back-end gross profit and dealership profit mix
F&I monetizes financing and attached protection products per retail sale, while parts and service earns a higher-margin recurring gross-profit stream. Gross-profit mix shows how those businesses can contribute far more profit than their revenue share implies.
F&I Gross Profit per Unit Dealer Gross Profit Mix Parts & Service Gross Margin
Inventory pressure and operating leverage
Vehicle inventory days provide context for availability, aging, and pricing pressure, while SG&A as a percentage of gross profit shows how the resulting dealership gross-profit pool converts through overhead.
Inventory Days Supply Dealer SG&A / Gross Profit

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.

ANOpen operating-model research →10 of 10 reviewed concepts in Automotive Dealership EconomicsSame-store vehicle transaction and front-end economics5 of 5 bridge concepts supportedContinue through this bridge:New-Vehicle Gross Profit per Unit New-Vehicle Revenue per Unit Used-Vehicle Gross Profit per Unit Used-Vehicle Revenue per Unit
PAGOpen operating-model research →8 of 10 reviewed concepts in Automotive Dealership EconomicsSame-store vehicle transaction and front-end economics5 of 5 bridge concepts supportedContinue through this bridge:New-Vehicle Gross Profit per Unit New-Vehicle Revenue per Unit Used-Vehicle Gross Profit per Unit Used-Vehicle Revenue per Unit
SAHOpen operating-model research →6 of 10 reviewed concepts in Automotive Dealership EconomicsSame-store vehicle transaction and front-end economics3 of 5 bridge concepts supportedContinue through this bridge:New-Vehicle Gross Profit per Unit Used-Vehicle Gross Profit per Unit

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Compare dealership cohorts

Compare dealer operating trends on a stable-store basis before acquisitions, dispositions, open points, or cohort rules distort the read.

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