Mileage-based billing is a pricing and reimbursement method where charging costs (or mobility costs) are calculated based on distance driven (e.g., €/km or miles) rather than directly billing the exact kWh delivered in each charging session. It is most commonly used in fleet reimbursement, employee benefit schemes, and mobility budgets—especially when direct session-level energy billing is difficult or when costs must be allocated across mixed charging scenarios (home, workplace, public).
What Is Mileage-Based Billing?
Instead of billing per kWh, mileage-based billing uses:
– Vehicle distance data (odometer readings, telematics, trip logs)
– A defined rate per kilometer/mile (fixed or variable)
– Optional adjustments for vehicle type, seasonality, or energy price indices
It can be applied to reimburse drivers for charging or to charge internal departments/cost centers for EV usage.
Why Mileage-Based Billing Matters in EV Charging
Mileage-based billing can solve practical problems in real-world operations:
– Simplifies reimbursement when drivers charge across many locations and networks
– Avoids dependence on consistent per-session billing data from multiple CPOs/eMSPs
– Supports mixed scenarios like home charging reimbursement where metering may not be MID-billing-ready
– Enables predictable cost allocation for fleets and corporate mobility budgets
– Reduces administrative overhead compared to collecting every charging receipt
It is especially relevant for organizations transitioning from fuel-card models to EV fleets.
How Mileage-Based Billing Works
Typical workflow:
– Capture distance driven (telematics, fleet platform, or verified odometer)
– Apply a reimbursement or charge rate (€/km)
– Optionally link the rate to expected consumption (kWh/100 km) and electricity price
– Issue payroll reimbursement, internal chargeback, or invoice
– Use exception rules for anomalies (unusual driving, missing logs)
Some programs combine mileage billing with charging data when available, using mileage as a fallback or normalization method.
Mileage-Based Billing vs kWh-Based Billing
Mileage-based billing
– Based on distance driven (€/km)
– Good for reimbursement and cost allocation across many charging sources
– Less accurate for energy use because efficiency varies by vehicle, driving style, temperature, and load
kWh-based billing
– Based on measured energy delivered (€/kWh)
– Best for public charging tariffs and transparent consumer billing
– Requires reliable metering (often MID metering) and session reporting
Mileage-based billing is typically an internal policy tool, while kWh billing is common for public charging transactions.
Key Inputs and Data Sources
– Odometer readings (manual or digital capture)
– Vehicle telematics and fleet management systems
– Standard consumption assumptions (kWh/100 km) by vehicle class
– Electricity price assumptions (fixed rate or indexed)
– Policy rules (cap limits, eligible trip types, business vs private mileage)
Benefits and Limitations
Benefits
– Simple to administer across mixed charging environments
– Predictable budgeting for fleets and employers
– Less dependency on roaming data quality and receipt collection
– Scales easily for large driver populations
Limitations
– Not a direct measure of energy delivered
– Can misestimate costs if efficiency varies widely (winter vs summer, towing, high-speed driving)
– Requires trustworthy mileage data and anti-fraud controls
– Less suitable for consumer public charging where price transparency is required at the point of sale
Common Use Cases
– Employee home charging reimbursement for company cars
– Fleet cost allocation by vehicle, depot, or department
– Mobility allowance programs replacing fuel-card reimbursement
– Temporary method during transition to full charging data integration
Related Glossary Terms
Fleet billing
Fleet telematics
Charging reimbursements
Home charging reimbursement
Tariff structure
Charging session reporting
CPMS
MID metering
Fleet carbon reporting
Cost center allocation