Finding
An EV uses about a quarter of the energy per mile, and that efficiency is what makes software control and autonomy practical
A gallon of gasoline holds 33.7 kWh of energy, so a 28 mpg car uses about 1.2 kWh per mile; a typical EV uses about 0.3 kWh. The difference is the drivetrain: an engine turns 25-30% of its fuel into motion and loses the rest as heat, while an electric motor and inverter deliver 85-90% of battery energy to the wheels. That holds whatever the electricity source, which is why the case for EVs stands on engineering alone.
Electric drive also changes what a vehicle can be. Motors respond in milliseconds and can be controlled per wheel, which makes stability control, regenerative braking and automated driving more precise than with an engine and hydraulics. A high-voltage battery powers sensors and compute without strain. And the components that improve - batteries, power chips, motors - follow manufacturing learning curves: battery pack prices averaged about $108/kWh in 2025 (BNEF), down roughly 90% in a decade. Those are the reasons ElectronsX treats the EV as the platform for autonomy rather than a cleaner version of the old car.
Comparison
Engine vs. electric drive
| Attribute | Gasoline car | Battery EV |
|---|---|---|
| Energy per mile | ~1.2 kWh-equivalent (28 mpg) | ~0.3 kWh |
| Drivetrain efficiency | ~25-30% | ~85-90% |
| Braking energy | Lost as heat | Partly recovered by regeneration |
| Torque response | Hundreds of milliseconds | Milliseconds; per-wheel control possible |
| Routine maintenance | Oil, filters, spark plugs, exhaust, transmission | Tires, brakes (less wear), cabin filter |
| Power for sensors and compute | 12 V system, alternator limited | High-voltage pack |
| Updates | Mostly mechanical; dealer visits | Over-the-air software |
Sources
Sources and scope
- Scope
- Engineering comparison of engine and electric drivetrains
- Sources
- EPA (33.7 kWh per gallon equivalence); BNEF battery price survey (2025); ElectronsX arithmetic
- Updated
- October 2026