August 2026 EV vs. Gasoline Car Fuel Cost Benchmark: Electricity Cost per 100 Miles vs. Gasoline at Regional Rates

1. Mechanical Powertrain Thermodynamics: Electric Motor Efficiency (85%–90%) vs. Internal Combustion Thermal Losses (70%–80%)

The fundamental economic advantage of electric vehicles is rooted in thermodynamics rather than energy commodity pricing. One gallon of standard 87-octane gasoline contains approximately 33.705 kilowatt-hours (kWh) of chemical thermal energy (equivalent to 114,000 BTU).

When that gasoline is combusted inside an internal combustion engine (ICE), only 20% to 30% of its thermal energy is successfully converted into rotational kinetic energy at the drive wheels. The remaining 70% to 80% is lost as waste heat through the radiator cooling loop, engine friction, pumping resistance, and exhaust gas discharge.

In contrast, a modern permanent magnet synchronous or AC induction electric traction motor converts 85% to 90% of stored battery electrical energy directly into rotational mechanical work. Furthermore, regenerative braking systems recover 60% to 70% of kinetic momentum during deceleration, pumping electricity back into the battery pack rather than dissipating it as friction heat through mechanical brake pads.

As a result, an electric vehicle requires only 30 to 34 kWh of electrical energy to travel 100 miles, whereas a 28 MPG gasoline vehicle consumes 3.57 gallons of gasoline containing 120.3 kWh of chemical energy to travel the exact same distance. In this comparison, the ICE vehicle consumes approximately 3.6 times more raw energy per mile than an electric vehicle.

2. Real-World Fuel Cost per 100 Miles: Standard EV (30 kWh/100 mi) vs. Standard ICE Vehicle (28 MPG) & Vehicle Classes

Calculating the exact fuel cost per 100 miles requires applying verified utility and fuel prices to standard EPA vehicle consumption profiles.

EV Fuel Cost per 100 Miles ($) = (Rated Battery kWh per 100 Miles ÷ Charging Efficiency) × Electricity Rate ($/kWh)

ICE Fuel Cost per 100 Miles ($) = (100 ÷ Vehicle Fuel Economy in MPG) × Gasoline Price ($/gallon)

In this benchmark scenario for standard mid-size crossover vehicles, charging an EV at home on a flat residential rate cuts estimated annual fueling expenditures from $1,750.80 down to $738.00—saving $1,012.80 in direct energy costs.

3. Charging Location Cost Arbitrage: Residential Off-Peak TOU vs. Flat Home Charging vs. Commercial DC Fast Charging

A critical variable in EV operating economics is the charging location and rate tariff. Unlike gasoline, which sells at a relatively narrow band across a metropolitan area, electricity pricing varies substantially depending on where, when, and how a driver plugs in.

1. Residential Off-Peak Time-of-Use (TOU) Rates: Many utilities (such as Georgia Power, ComEd, PG&E, and Xcel Energy) offer specialized EV TOU tariffs with super-off-peak rates between midnight and 6:00 AM averaging 7.0¢ to 9.5¢/kWh (modeled at 8.5¢/kWh). In this modeled scenario, fueling an EV costs $2.83 per 100 miles (2.83¢/mile), reducing annual fuel expenses for 12,000 miles to $339.60.

2. Standard Flat Residential Tariff: Charging on a standard flat residential tier (18.44¢/kWh national average) yields $6.15 per 100 miles (6.15¢/mile) and $738.00 annually under model assumptions.

3. Commercial Level 2 Public Stations: Public Level 2 charging at workplace lots, hotels, and municipal garages typically bills between $0.22 and $0.35/kWh (modeled benchmark: $0.28/kWh), resulting in an estimated $9.33 per 100 miles.

4. Commercial DC Fast Charging (DCFC / Superchargers): High-power public fast chargers (150 kW to 350 kW) commonly bill between $0.38 and $0.55/kWh (modeled at a $0.45/kWh benchmark average), reflecting station equipment amortization, site lease fees, and commercial utility demand charges. At $0.45/kWh, charging costs an estimated $15.00 per 100 miles (15.00¢/mile).

In this benchmark scenario, drivers who cannot charge at home and must rely exclusively on high-rate commercial DC fast chargers ($0.45/kWh) experience fuel costs comparable to or slightly higher than a 28 MPG gasoline vehicle at $4.085/gal. Because public fast-charging tariffs and membership discounts vary significantly by network and state, maximizing operational fuel savings generally depends on accessible residential or workplace Level 2 charging.

4. The Official DOE eGallon Metric: Energy Equivalency (33.705 kWh/GGE) and Nationwide Fuel Discount Rate

To establish a direct consumer comparison between electricity and retail gasoline, the U.S. Department of Energy (DOE) created the "eGallon" pricing methodology. The eGallon represents the cost of fueling an electric vehicle to travel the exact distance that an average comparable gasoline car travels on one gallon of fuel.

eGallon Price ($/gallon) = FE_gas × EC_EV × Electricity Price ($/kWh)

Where:

• FE_gas = Average fuel economy of comparable gasoline passenger car (28.0 miles per gallon).

• EC_EV = Average grid electricity consumption of light-duty electric vehicles (0.3333 kWh per mile, representing 30 kWh/100 mi with 90% charging efficiency).

• FE_gas × EC_EV = 28.0 × 0.3333 = 9.333 kWh per eGallon.

Multiplying 9.333 kWh by the May 2026 U.S. residential electricity average of 18.44¢/kWh yields:

U.S. National Average eGallon Price = 9.333 kWh × $0.1844/kWh = $1.721/eGallon

Comparing $1.72 per eGallon against the $4.085 per gallon national gasoline average demonstrates that charging an electric vehicle at home in this national benchmark scenario is mathematically equivalent to purchasing gasoline at an effective 57.9% discount ($2.365 saved on every gallon equivalent).

5. 10-State Regional Fuel Parity & Annual Driving Cost Matrix (August 2026 EIA Gasoline & Electricity Rates)

Because both electricity rates and gasoline pump prices vary across geographic regions, the net dollar savings of driving electric depend heavily on state-level utility tariffs and refinery logistics.

In Pacific and Northwest markets (Washington, Oregon), abundant low-cost hydroelectric power combined with high fuel taxes creates modeled annual fuel savings exceeding $1,500/year. In California, where electricity rates average 32.40¢/kWh, high gasoline prices ($4.95/gal) preserve strong modeled annual savings of over $825/year.

Across all 10 representative states, residential EV charging in this benchmark comparison delivers substantial financial savings compared to buying gasoline, with net modeled annual fuel cost reductions ranging from $700.80 (New York) to $1,532.40 (Washington).

6. Economic Sensitivity & Breakeven Gasoline Price Formula: Calculating Your Household Parity Point

Drivers can determine their personal economic breakeven threshold—the exact gasoline price at which a gasoline vehicle becomes cheaper to operate than an EV—using a straightforward mathematical relationship.

Breakeven Gasoline Price ($/gallon) = EV Cost per 100 Miles × (Gas Car MPG ÷ 100)

Under standard national baseline parameters ($6.15 per 100 miles for EV, 28 MPG for gas car):

Breakeven Gas Price = $6.15 × (28 ÷ 100) = $6.15 × 0.28 = $1.722/gallon

This indicates that in this modeled national scenario, retail pump gasoline would need to fall below $1.72 per gallon before a standard 28 MPG gasoline vehicle becomes cheaper to operate than charging an EV at home.

If a driver enrolls in an off-peak EV time-of-use rate ($0.085/kWh), the breakeven gasoline floor drops to an estimated $0.79 per gallon ($2.83 × 0.28).

Conversely, in a scenario where a driver relies on commercial DC fast chargers at $0.45/kWh ($15.00 per 100 miles), the breakeven gasoline price is $4.20 per gallon ($15.00 × 0.28). In scenarios where local pump gasoline is cheaper than $4.20/gal, public fast charging at 45¢/kWh is more expensive than buying gasoline for a 28 MPG vehicle.