The Variance Problem
Every fuel operation runs a variance calculation: what went in minus what came out should equal current inventory. When it doesn’t, the difference is variance — and variance represents money that can’t be accounted for.
A well-run retail fuel operation targets variance under 0.5% of throughput. Many operations run variance of 2–3%, sometimes higher, and accept it as an operational cost rather than an accountability problem.
At scale, the difference matters significantly. An operation moving 500,000 gallons per month at $3.50/gallon has $21 million in monthly fuel flow. A variance of 0.5% is $105,000 annually. A variance of 2.5% is $525,000 annually. The difference between those two numbers — $420,000 per year — is not measurement noise. It is unaccounted fuel.
ArgusIQ gives fuel operations the real-time accountability layer that turns variance analysis from a monthly reconciliation exercise into an operational tool — identifying where variance originates before it accumulates into a monthly line item.
What Real-Time Tank Monitoring Changes
Beyond ATG Status Polling
Most fuel operations have Automatic Tank Gauges. The ATG knows the current tank level. The problem isn’t the sensor — it’s how the data is used.
ATG data polled at intervals and reviewed in monthly reconciliation shows you that variance occurred. It doesn’t show you when, at what rate, or in correlation with which operational events.
ArgusIQ IoT Hub connects to ATG systems (Veeder-Root TLS-350/450, Franklin Fueling i-Site, OPW, and others via Modbus or vendor API) and captures level readings at configurable intervals — every minute for operations under active monitoring, every 5–15 minutes for standard monitoring. The data arrives in ArgusIQ Asset Hub as a continuous time series, not a daily snapshot.
With continuous level data, the variance picture changes:
- A slow subsurface leak appears as a consistent downward drift in overnight level readings that exceeds the rate expected from vapor loss alone
- A dispensing discrepancy appears as a level drop not matched by a corresponding dispenser transaction
- A delivery variance appears as the received volume being measurably different from the delivered volume according to the delivery manifest
- Product theft during delivery appears as the delivery record showing less volume delivered than the actual tank level change
Delivery Verification
Every delivery creates a reconciliation opportunity. The delivery manifest says 8,400 gallons were delivered. The tank level before delivery was 4,200 gallons. The tank level immediately after delivery reads 12,500 gallons.
8,400 + 4,200 = 12,600. The tank received 12,300. Delivery variance: 300 gallons (3.6% of delivery).
ArgusIQ captures the pre-delivery level, post-delivery level, and delivery manifest quantity as a delivery event record linked to the tank’s asset record. Delivery variance is calculated automatically for every delivery at every site.
A driver whose deliveries consistently show 1.5% variance is a pattern. A site where deliveries from one carrier show 2% variance and deliveries from another show 0.4% is a pattern. Patterns that emerge from structured records don’t emerge from monthly reconciliation spreadsheets.
Multi-Site Fuel Operations: The Portfolio View
For companies operating fuel infrastructure across multiple locations — fuel distributors with depot networks, fleet operators with multiple yard fueling sites, construction companies managing fuel at active project sites — single-site visibility isn’t enough.
ArgusIQ Dashboard and Widget System provides the portfolio view:
Inventory dashboard: Current level for every tank at every site, shown as a percentage of capacity and in gallons. Sites approaching reorder level highlighted. Run-time to empty at current consumption rate calculated for each tank.
Variance dashboard: Current-month variance by site, by tank, by delivery carrier. Sites running outside acceptable variance thresholds highlighted for investigation.
Alert dashboard: Active alerts across all sites — low level alerts, delivery variance alerts, high-high level alerts (potential overflow), communication alerts (ATG not reporting).
The multi-site dashboard eliminates the need to log into each site’s monitoring system individually. For operations with 20–100 fuel locations, this consolidation alone reduces the daily monitoring burden significantly.
Fleet Fuel Accountability
The Fleet Fueling Problem
Fleet operations — trucking companies, construction equipment fleets, government vehicle fleets — manage fuel accountability at fuel islands where company vehicles fill up. The accountability challenge: knowing that fuel dispensed from company pumps actually went into company vehicles.
Common fuel accountability problems in fleet operations:
- Skimming: Authorized users dispensing fuel in personal containers in addition to or instead of the vehicle tank
- Unauthorized dispensing: Access credentials shared with unauthorized users outside operating hours
- Key tag fraud: Lost or duplicated key tags or access fobs enabling unauthorized access
ArgusIQ integrates with fleet fueling systems — fuel management systems from vendors like Gasboy, Gilbarco, and others — to provide dispenser-level accountability:
- Dispenser-level transaction logging (time, vehicle ID, driver credential, volume dispensed)
- Cross-reference against vehicle check-in/check-out records (vehicle should be on-site to receive fuel)
- Dispenser access outside business hours — alert if dispenser activated at 11 PM on a site that closes at 6 PM
- Cumulative fuel-to-hours ratio per vehicle — a vehicle fueling at 5 miles/gallon when its class typically runs 7 miles/gallon is either mechanically inefficient or the fuel records don’t match the actual vehicle
Agricultural Fuel Accountability
Farm operations typically manage diesel fuel for equipment at on-site fuel storage — one or two large above-ground tanks from which tractors, combines, and equipment fill as needed.
The accountability problem is scale: a large farm operation may have $150,000 to $300,000 in annual fuel cost, managed with a manual paper log at the fuel tank. Log accuracy depends on who fills out the log and whether they do it before or after the fact.
ArgusIQ IoT Hub connects to the tank-level sensor (typically a float gauge or ultrasonic sensor) and to any electronic access controls on the dispenser. Level readings generate a continuous inventory record. Access events create a log. When the tank shows 600 gallons dispensed between Monday and Thursday but the log accounts for 450, the discrepancy is visible immediately rather than at the end-of-month count.
Regulatory Compliance: UST Monitoring
Underground Storage Tank (UST) regulations require monthly inventory reconciliation for regulated fuel storage. The EPA and state regulators have specific requirements for the frequency and accuracy of reconciliation, the format of records, and the notification requirements for releases.
ArgusIQ generates the UST monthly inventory reconciliation documentation from the continuous level and transaction records maintained in Asset Hub. The reconciliation calculation — beginning inventory + deliveries - sales = ending inventory, compared against actual level — is automatic. The documentation is produced in a format appropriate for regulatory record-keeping requirements.
Real-time level monitoring and variance tracking provides the continuous release detection that monthly reconciliation cannot.
Hydraulic and Process Fluid Management
The same inventory accountability framework that applies to fuel tanks applies to other fluid storage: hydraulic fluid reservoirs, lubrication oil storage, cutting fluid tanks, chemical storage for industrial processes, and water/glycol coolant systems.
ArgusIQ Asset Hub treats each fluid storage asset the same way it treats fuel tanks: current level, historical level trend, delivery records, consumption rate, and variance analysis. The same alert conditions — low level, high-high level, delivery variance, overnight consumption anomaly — apply to any stored fluid.
For industrial operations managing multiple fluid types across a facility — hydraulic fluid for presses, coolant for machining centers, lubrication oil for compressors — the multi-asset fluid inventory view provides the portfolio visibility that individual tank gauges cannot.
Ask Argus for Fuel Operations
ArgusIQ’s Ask Argus capability gives fuel operations teams natural language access to the inventory record:
“Which sites have variance above 1% for this month?”
“What was the fuel level at Site 7 at 11 PM on October 15th?”
“Show me all delivery variances above 2% for the past 90 days by delivery driver.”
“Which tanks are projected to reach reorder level before next Friday?”
“What’s the average fuel cost per machine hour for each equipment class this month?”
These queries return answers from the Asset Hub time series and CMMS records — turning the accumulated fuel accountability data into operational intelligence rather than a raw data archive.
Talk to our team about ArgusIQ for your fuel and fluid operations.