Answer
How do gas stations track fuel margin?
Definition.
Fuel margin has two flavors: target (what the operator set when repricing) and realized (what actually landed after card fees, fuel-tax timing, and any wet-stock loss). The gap between target and realized, typically 1–3¢/gal, is the dial operators try to close. Tracking happens per grade (regular, mid-grade, premium, diesel, DEF) and per shift where the data supports it.
Step by step.
Set target margin per grade at repricing.
When you reprice (typically daily on regular and mid-grade), set the target. E.g., regular at retail $4.29, cost $4.11, target margin 18¢/gal.
Track every transaction.
Each fuel sale records grade, gallons, retail price, tender type, and the wholesale cost at the time of the transaction.
Compute realized margin per gallon.
Realized = retail price − wholesale cost − card fee (typical 0.5–1.0¢/gal). Average across the period.
Reconcile against the dispenser totalizer.
POS gallons should match dispenser totalizer gallons. Variance suggests pump miscalibration or unrecorded sales.
Reconcile against tank inventory (ATG or manual stick).
Daily: ATG inventory delta = previous_inventory + deliveries_received − dispensed_gallons. Variance is wet-stock loss.
Allocate wet-stock loss to realized margin.
If wet-stock variance is +50 gallons over the day at $4.11 cost, $205 hits the realized margin column for that day.
Compare realized vs. target across the period.
A 0.5¢/gal sustained gap = $150/month per 30,000 gallons. Investigate persistent gaps (pump calibration, supplier cost mistracking, theft).
A concrete example.
Regular gasoline: retail $4.29, wholesale cost $4.11, target margin 18¢/gal. Over the day, 1,200 gallons dispensed. POS recorded 1,200 gallons sold at $4.29; gross sales $5,148. Wholesale cost $4,932. Card fee at 0.75¢/gal = $9. Wet-stock variance: tank dropped 1,215 gallons (15-gallon over-dispense), wet-stock loss = 15 × $4.11 = $61.65. Realized margin = $5,148 − $4,932 − $9 − $61.65 = $145.35. Per gallon: $145.35 / 1,200 = 12.1¢. Target was 18¢. Gap: 5.9¢, over the warning threshold; pump-calibration check ordered.
Checklist.
- Target margin set per grade at each repricing
- Wholesale cost recorded per transaction
- Realized margin computed (retail − cost − card fee)
- POS gallons matched to dispenser totalizer daily
- ATG (or manual stick) reading recorded daily
- Wet-stock variance computed daily
- Wet-stock loss allocated to realized margin
- Realized vs. target gap reviewed daily
- Persistent gaps escalated (pump check, supplier audit)
Common mistakes.
Computing margin from POS sales without card-fee allocation.
Card fees are 0.5–1.0¢/gal in reality. Skip them, and your realized margin number is overstated by a meaningful amount.
Reading the dispenser totalizer once per week.
Wet-stock loss compounds. Daily reads catch the variance before it becomes a $1,500 month.
Tracking margin at the station level instead of per grade.
Regular and premium have very different margin profiles. Aggregating obscures grade-level issues like a premium-only calibration drift.
Ignoring the prepaid SUT timing in California.
California gasoline carries prepaid SUT that hits the operator before collection. Mis-timing inflates apparent margin in the prepayment period and depresses it later. Allocate correctly per period.
How StationPro fits in
The StationPro angle.
Feature
Fuel reconciliation & margin tracking
Pump, POS, BOL, and ATG, matched daily with margin visibility.
Buyer guide
Fuel margin tracking software with live target-vs-realized per grade.
Pump totalizer ↔ POS sales ↔ BOL deliveries ↔ ATG tank readings, reconciled daily, with realized margin computed live against your configure…
FAQs.
What's a normal target margin on regular gasoline?
15–25¢/gal at most independent stations. Highway and high-volume sites run lower; rural and convenience-attached sites run higher. The number drifts with wholesale and competitive pressure; the discipline is tracking realized vs. target, not chasing a specific number.
Where does wet-stock loss usually come from?
Pump miscalibration (mechanical drift over months), tank evaporation (small, typically under 0.1%), measurement error (manual stick reads), or theft (rare but real). Daily ATG-vs-dispensed reconciliation distinguishes these, calibration drift is consistent, evaporation is small and seasonal, theft has a different signature.
How does the credit-card fee impact margin?
Typical interchange + processor fees run 0.5–1.0¢/gal on fuel transactions. On 30,000 gallons/month that's $150–300/month. Operators sometimes negotiate flat fuel-fee structures with their processor to reduce this.
See where your station is leaking money.
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