How GPS and Fuel-Card Data Can Help Detect Fuel Fraud

Fuel cards make purchasing fuel more convenient, but transaction records alone do not confirm that every purchase was legitimate. A statement may show when and where a card was used, how much fuel was purchased, and what it cost. It cannot independently prove that the assigned vehicle was present, received the fuel, or could reasonably hold the purchased quantity.

GPS fleet tracking provides that missing operational context. By connecting fuel-card transactions with vehicle locations, trip histories, fuel information, and asset details, businesses can identify suspicious activity much faster. Fleet fuel telematics combines GPS, vehicle diagnostics, and fuel-purchase data to create a more complete record of how fuel is bought and used.

What Is Fuel Fraud in a Commercial Fleet?

Fleet fuel fraud includes unauthorized or deceptive purchases made using a company fuel card or fuel account. It may involve an employee using a card to fuel a personal vehicle, purchasing more fuel than the assigned vehicle can hold, buying an unauthorized fuel type, sharing a card or driver PIN, or making purchases unrelated to business operations.

Fraud can also come from outside the organization. For example, criminals may obtain card information through stolen cards, compromised account credentials, or pump skimmers. The Federal Trade Commission explains that gas-pump skimmers can secretly capture payment-card information, which can later be used for unauthorized transactions.

Not every questionable purchase is intentional fraud. Incorrect vehicle assignments, inaccurate merchant locations, delayed transaction feeds, replacement vehicles, shared cards, and data-entry errors can also create discrepancies. For that reason, telematics should be used to identify transactions that require investigation, not to treat every mismatch as proof of misconduct.

Why Fuel-Card Records Are More Useful When Combined With GPS

A typical fuel-card transaction may contain the purchase date and time, merchant location, fuel type, volume, cost, card number, and assigned driver or vehicle. GPS telematics can add the vehicle’s recorded position, trip status, route, mileage, and other supported vehicle information.

When these two datasets are reviewed together, fleet managers can ask much more useful questions. Was the assigned vehicle near the station when the card was used? Was it operating in a different city? Did the vehicle stop long enough for refueling? Was the purchase consistent with its fuel type and tank capacity? Did vehicle data indicate that a fill-up occurred?

MyGeotab’s Fuel Transactions page consolidates transaction time, location, and cost information and compares transaction records with vehicle telematics. Depending on the available data and configuration, the system can identify potential fuel-type, tank-size, and location mismatches for review.

Location Mismatches Can Reveal Unauthorized Card Use

One of the clearest warning signs occurs when a fuel card is used at one location while the assigned vehicle is somewhere else.

Suppose a transaction appears at a gas station in one city at 2:15 p.m., but GPS history shows that the assigned truck was parked at a customer site 30 miles away. The discrepancy could indicate that the card was used for another vehicle, shared with an unauthorized person, copied, or entered under the wrong asset.

MyGeotab can display a transaction location on a map alongside the vehicle’s location history, making it easier to determine whether the vehicle was reasonably close to the station. The platform’s fuel-transaction review tools are designed to highlight mismatches between card records and telemetry data.

Location analysis should still account for normal operational factors. Fuel-card merchant records may identify a corporate address instead of the exact pump, transaction timestamps may reflect authorization or settlement times, and GPS data may be temporarily unavailable. A reasonable time-and-distance tolerance can reduce false positives while still identifying meaningful exceptions.

Tank-Capacity Checks Can Expose Implausible Purchases

A transaction may warrant review when the purchased volume exceeds the assigned vehicle’s tank capacity. For example, a 35-gallon gasoline purchase linked to a vehicle with a 20-gallon tank is unlikely to represent a normal fill-up for that asset.

A smaller purchase can also be suspicious when it occurs soon after another large fill-up. Multiple fuel purchases within an unusually short period may suggest that the card was used to fill another vehicle or portable containers. However, legitimate explanations may include split transactions caused by pump limits, auxiliary tanks, fuel-powered equipment, or incomplete vehicle specifications.

Accurate asset records are essential. Tank capacities, auxiliary tanks, fuel types, and card-to-vehicle assignments should be reviewed before managers rely on automated mismatch results. MyGeotab does not retroactively recalculate older mismatches when an asset’s tank size, fuel type, or assignment is changed, so correct configuration helps make future results more dependable.

Fuel-Type Mismatches Can Identify Misuse or Data Problems

Comparing the purchased product with the assigned vehicle’s powertrain can uncover another important exception. A diesel purchase assigned to a gasoline vehicle, or a gasoline charge assigned to a diesel truck, deserves attention.

The cause may be fraud, but it may also be an incorrect product code, an improperly assigned card, or outdated vehicle information. The value of automated detection is that the fleet manager does not need to discover the issue weeks later while manually reviewing a statement. The transaction can be separated from routine purchases and examined with its supporting trip and vehicle records.

This analysis can also detect repeated policy violations, such as purchasing premium gasoline for a vehicle that only requires regular fuel. The exact product information available depends on the fuel-card provider and integration.

GPS History Can Identify Off-Route and After-Hours Purchases

A purchase may be technically close to the assigned vehicle but still fall outside expected business activity. A card used late at night, on a weekend, far from an assigned route, or outside the vehicle’s normal service area may indicate unauthorized use.

Trip history adds context that a fuel-card statement cannot provide. It can show whether the vehicle was completing a scheduled job, traveling toward an approved destination, parked at an employee’s home, or being used outside established business hours. Geofences can provide additional context by identifying activity near approved fueling stations, company yards, customer sites, or designated service areas.

Patterns matter more than a single isolated event. Repeated purchases outside normal operating hours, recurring visits to an unapproved station, or transactions consistently occurring away from assigned routes may justify a closer review.

Fuel-Level and Consumption Data Can Help Validate Fill-Ups

Where compatible vehicle data is available, a legitimate purchase should usually correspond with a plausible change in fuel level or subsequent fuel use. If a card record shows a large purchase but vehicle data does not indicate a comparable fill-up, the fuel may have gone into another vehicle or container.

Fuel-level readings are not always precise enough to compare gallon for gallon. Tank shape, sensor resolution, vehicle movement, parking angle, data availability, and manufacturer-specific reporting can affect the measurement. The more reliable approach is to look for a reasonable increase and then evaluate it with the transaction volume, tank capacity, location, and trip history.

Longer-term consumption analysis can reveal less obvious losses. MyGeotab’s Fuel and Energy Usage reports help fleets validate fill-ups and identify fuel-use patterns. If a vehicle’s recorded purchases rise substantially without a corresponding increase in mileage, engine hours, idling, or workload, managers can investigate whether the difference comes from fraud, mechanical problems, inefficient operation, or inaccurate data.

Unassigned Transactions Can Expose Gaps in Accountability

A fuel purchase cannot be validated effectively when it is not connected to the correct vehicle or driver. Unassigned transactions may result from missing vehicle identification numbers, inconsistent cardholder names, new cards, incorrect account mappings, or drivers who were not assigned to an asset at the time of purchase.

These records should not be ignored simply because the system could not match them automatically. An unassigned purchase represents a gap in accountability and should be reconciled with card records, driver schedules, receipts, and vehicle activity.

MyGeotab supports asset-based matching for cards kept with specific vehicles and driver-based matching for cards carried by operators who use different vehicles. Choosing the correct method and keeping assignments current can substantially improve the quality of fraud detection.

Integrated Data Makes Investigations Faster and Fairer

Without integration, an administrator may need to compare fuel statements, receipts, driver schedules, GPS histories, and vehicle specifications manually. The process is slow enough that a suspicious transaction may not be discovered until the monthly statement arrives.

Centralized data allows managers to focus on exceptions instead of examining every purchase equally. A reviewer can open a flagged transaction, confirm the vehicle’s location, check its trip history, compare the quantity with tank capacity, and document the findings.

This approach also supports fairer investigations. A location mismatch may be resolved by discovering that a replacement vehicle was used. A second transaction may be explained by a pump limit. An apparent fuel-type mismatch may result from incorrect asset data. Reviewing several independent records helps managers distinguish legitimate exceptions from patterns that require corrective action.

Fuel-Fraud Detection Should Be Supported by Clear Policies

Technology works best when employees understand how company fuel cards may be used. Policies should explain which vehicles and products are authorized, whether cards are assigned to drivers or vehicles, when receipts are required, how odometer entries should be completed, and how lost or compromised cards must be reported.

The U.S. General Services Administration’s fleet-card guidance provides a useful example of card accountability. It specifies that a vehicle-assigned fleet card should be used only for its corresponding vehicle and recommends authorization controls to help prevent misuse. Private fleets can adapt similar principles to their own operations, card providers, and employment policies.

Consistent enforcement is equally important. Managers should document the transaction, supporting data, driver explanation, and final resolution. Access to sensitive fuel and driver information should be limited to authorized personnel, and investigations should follow company policy and applicable employment and privacy requirements.

Turning Fuel Data Into Actionable Oversight

GPS and fuel-card integration does more than identify individual suspicious charges. It creates a repeatable process for reviewing fuel activity across the fleet. Location mismatches, impossible purchase quantities, incorrect fuel types, unusual purchase frequency, after-hours activity, missing fill-ups, and unassigned transactions can be prioritized for investigation.

The effectiveness of that process depends on accurate vehicle profiles, consistent card assignments, compatible hardware, reliable transaction imports, and well-defined review procedures. When those elements are in place, fleet managers gain a clearer view of where fuel dollars are going and can respond to possible misuse before it becomes a recurring expense.

Improve Fuel Oversight With GPS Tracking America

Combining Geotab GPS information with compatible fuel-card data can help your business identify suspicious transactions, reduce manual reconciliation, and strengthen accountability across the fleet. GPS Tracking America can help you evaluate available fuel-management capabilities, configure the appropriate vehicle and driver assignments, and build reports that support your review process. To discuss a Geotab solution for your operation, contact us today.