How the global model works
For each segment, the model estimates energy, purchase-price and maintenance costs per mile for internal-combustion-engine (ICE) and battery-electric-vehicle (EV) cost structures. Purchase price and lifetime maintenance are divided by Harmony Capital Modeled Lifetime Miles; energy cost is calculated from the selected fuel or electricity price and modeled efficiency. The weighted total uses each segment’s share of Harmony Capital Modeled Global Miles.
The model does not include financing, depreciation or resale value, incentives, taxes, insurance, charging infrastructure, downtime or discounting.
EV $/mile = electricity price ÷ miles per kilowatt-hour (mi/kWh) + EV price ÷ lifetime miles + EV maintenance ÷ lifetime miles
EV advantage = ICE $/mile − EV $/mile
Weighted result = Σ(segment result × Harmony Capital Modeled Global Miles) ÷ Σ(Harmony Capital Modeled Global Miles)
Harmony Capital Modeled Global Miles
The workbook’s 15.55 trillion annual miles are a Harmony Capital scenario allocation of international road-transport activity across passenger cars, SUVs, light pickups, commercial vans, medium-duty trucks, heavy-duty trucks and buses. The values are not a directly reported series from the International Transport Forum (ITF), International Energy Agency (IEA) or another provider.
The allocation is informed by international passenger-transport, freight-transport, vehicle-stock and utilization indicators from ITF, the International Organization of Motor Vehicle Manufacturers (OICA), IEA, the United Nations Conference on Trade and Development (UNCTAD) and regional sources, together with Harmony Capital modeling assumptions. Lifetime miles are separate Harmony Capital assumptions and do not drive the global-mile allocation.
Vehicle-technology definition
“EV” refers to a battery-electric vehicle operating entirely on electricity. Conventional hybrids and plug-in hybrids are not modeled as separate technologies. EV mileage share is presented for market context and does not affect the modeled full-switch value.
Energy-price references
The regional panel uses static U.S. Energy Information Administration (EIA) retail observations to help users frame their own forward assumptions; the current calculator does not automatically retrieve external data. Gasoline presets reflect the four-week average of EIA regular-gasoline prices through September 28, 2026. Residential electricity presets are Harmony Capital calculations using EIA state revenue and sales for January through July 2026, aggregated into the same five petroleum regions. These U.S. observations are context, not global averages.
Automatic diesel assumption
Unless manual mode is selected, diesel equals the user’s gasoline assumption multiplied by 1.18. This is a rounded five-year U.S. retail proxy based on EIA regular-gasoline and on-highway diesel prices for 2021–2025; it is not a global pump-price ratio. Users may override it by selecting Manual.
Modeled annual full-switch value
This scenario multiplies each segment’s EV advantage per mile by Harmony Capital Modeled Global Miles for one year. It assumes all modeled miles move from the ICE cost structure to the battery-electric cost structure; it is not a forecast of adoption or realizable savings.

