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How-to guide · Michigan City Ford · Michigan City, IN
How Do Hybrid Cars Work?
A hybrid uses a gasoline engine and an electric motor together, and it can't be plugged in. Here is how the two work as a team, how the battery recharges itself, the key parts, the main hybrid types and where hybrids save the most fuel, from the U.S. Department of Energy's Alternative Fuels Data Center (AFDC) and fueleconomy.gov.
Engine + motora gasoline engine works with one or more battery-powered electric motors
No plughybrids charge through regenerative braking and the engine, not an outlet
24%-38%of the fuel's energy moves a hybrid down the road, depending on the drive cycle
City drivingis where hybrids save the most, thanks to braking energy recovery and stop/start
The short answer
A hybrid car combines a gasoline engine with one or more electric motors powered by a battery. The motor assists the engine when you accelerate or climb, can move some hybrids on its own at low speeds, and the engine can shut off when you stop. The battery recharges through regenerative braking and the engine, so you never plug it in.
How a hybrid works: three technologies
A hybrid electric vehicle (HEV) is powered by an internal combustion engine and one or more electric motors that use energy stored in batteries. Fueleconomy.gov says most hybrids use several advanced technologies together:
Regenerative braking
Recaptures energy normally lost during coasting or braking. The forward motion of the wheels turns the motor, which generates electricity and helps slow the vehicle.
Electric motor drive and assist
The electric motor helps the engine when accelerating, passing or climbing hills, which allows a smaller, more efficient engine. In some hybrids, the motor alone moves the vehicle at low speeds, where gasoline engines are least efficient.
Automatic stop/start
Shuts the engine off when the vehicle comes to a stop and restarts it when you press the accelerator, which reduces energy wasted idling.
From fueleconomy.gov's How Hybrids Work page and the AFDC's How Do Hybrid Electric Cars Work? page, read November 9, 2026.
How a hybrid charges its battery
A hybrid cannot be plugged in to charge the battery. Instead, the battery is charged through regenerative braking and by the internal combustion engine. During braking, the electric motor works as a generator and stores the captured energy in the battery, so energy that would otherwise be lost as heat at the brakes can be used again to drive the wheels.
The battery can also power auxiliary loads and reduce engine idling when the vehicle is stopped. The AFDC says these features together result in better fuel economy without sacrificing performance.
From the AFDC's How Do Hybrid Electric Cars Work? and Hybrid Electric Vehicles pages and fueleconomy.gov's Where the Energy Goes: Hybrids page, read November 9, 2026.
Key parts of a hybrid
| Part | What it does |
|---|---|
| Internal combustion engine | A spark-ignited gasoline engine: fuel is combined with air and ignited by a spark plug. |
| Electric traction motor | Uses power from the traction battery pack to drive the wheels. Some vehicles use motor generators that do both the drive and regeneration jobs. |
| Electric generator | Generates electricity from the rotating wheels while braking and sends that energy back to the traction battery pack. |
| Traction battery pack | Stores electricity for the electric traction motor. |
| Power electronics controller | Manages the flow of electrical energy from the traction battery, controlling the motor's speed and the torque it produces. |
| DC/DC converter | Converts higher-voltage DC power from the traction battery to the lower-voltage DC power that runs accessories and recharges the auxiliary battery. |
| Auxiliary battery | A low-voltage battery that provides electricity to start the car before the traction battery is engaged and powers accessories. |
| Transmission | Transfers mechanical power from the engine and/or electric traction motor to drive the wheels. |
| Fuel tank and exhaust | The tank stores gasoline for the engine; the exhaust system carries exhaust gases out through the tailpipe, and a three-way catalyst reduces emissions. |
| Thermal system | Keeps the engine, electric motor, power electronics and other components in their proper operating temperature range. |
From the AFDC's How Do Hybrid Electric Cars Work? page, read November 9, 2026.
Mild vs. full hybrids, parallel vs. series
Mild hybrids
Also called micro hybrids. A battery and electric motor help power the vehicle and can let the engine shut off when stopped, but they cannot power the vehicle on electricity alone. They generally cost less than full hybrids but give less fuel economy benefit.
Full hybrids
Larger batteries and more powerful electric motors that can power the vehicle for short distances and at low speeds. They cost more than mild hybrids but give better fuel economy benefits.
Parallel hybrids
The most common hybrid design: the engine and the electric motor are both connected to the wheels through mechanical coupling, and both drive the wheels directly.
Series hybrids
Only the electric motor drives the wheels. This design is more commonly found in plug-in hybrid electric vehicles.
From the AFDC's Hybrid Electric Vehicles page, read November 9, 2026.
Why hybrids do best in city driving
Fueleconomy.gov says about 24% to 38% of the energy in the fuel you put in a hybrid is used to move it down the road, depending on the drive cycle. As in a conventional gasoline vehicle, most of the energy in the fuel is lost in the engine, primarily as heat.
| Driving | What happens |
|---|---|
| Stop-and-go city driving | Hybrids turn the engine off at stops and use regenerative braking, so they are more efficient than comparable conventional vehicles, especially in stop-and-go traffic. The electric motor can sometimes power the vehicle at lower speeds. |
| Highway driving | There is little braking and little to no idling, so regenerative braking and stop/start offer little advantage over a conventional vehicle on the highway. |
| Accessories | Seat and steering wheel warmers and climate control fans use noticeably more energy than small loads like door locks and signal lights, and they lower fuel economy. |
From fueleconomy.gov's Where the Energy Goes: Hybrids page, read November 9, 2026. Energy use varies from vehicle to vehicle.
Service at Michigan City Ford
The Works® at Michigan City Ford includes a synthetic blend oil change, tire rotation and pressure check, brake inspection, Multi-Point Inspection, fluid top-off, battery test, and a filter, belts and hoses check. Our advice: because hybrids still have a gasoline engine, plan on regular oil changes and inspections.
Schedule service online and see our service specials first. Michigan City Ford is at 3930 Franklin St. in Michigan City. Get directions.
Michigan City Ford service hours
| Days | Hours |
|---|---|
| Mon-Fri | 7:30 a.m.-5:30 p.m. |
| Sat | 8 a.m.-3 p.m. |
| Sun | closed |
From Michigan City Ford's website, November 9, 2026. Holiday hours can differ.
Hybrid car FAQ
How does a hybrid car work?
A hybrid pairs a gasoline engine with one or more electric motors powered by a battery. The motor helps the engine accelerate and climb, can move some hybrids on its own at low speeds, and in many hybrids the engine can shut off at stops. The battery is recharged by regenerative braking and the engine, according to the U.S. Department of Energy.
Do you have to plug in a hybrid car?
No. The AFDC says a hybrid electric vehicle cannot be plugged in to charge the battery. It charges through regenerative braking and the internal combustion engine.
Can a hybrid run on electricity only?
Some can, briefly. The AFDC says full hybrids can power the vehicle for short distances and at low speeds on electricity, while mild hybrids cannot power the vehicle using electricity alone.
What is regenerative braking in a hybrid?
Regenerative braking recaptures energy normally lost during coasting or braking. The wheels turn the electric motor, which generates electricity, stores it in the battery and helps slow the vehicle, according to fueleconomy.gov.
Why do hybrids get better mileage in the city than on the highway?
City driving has more braking and idling. Hybrids recover braking energy and shut the engine off at stops, so fueleconomy.gov says they are most efficient in city driving and offer little advantage over a conventional vehicle on the highway.
What is the difference between a mild hybrid and a full hybrid?
A mild hybrid uses a battery and motor to help power the vehicle and can shut the engine off when stopped, but cannot drive on electricity alone. A full hybrid has a larger battery and more powerful motor that can power the vehicle for short distances and at low speeds, per the AFDC.
What does The Works at Michigan City Ford include?
The Works® at Michigan City Ford includes a synthetic blend oil change, tire rotation and pressure check, brake inspection, Multi-Point Inspection, fluid top-off, battery test, and a filter, belts and hoses check.
Time for routine service?
Book The Works at Michigan City Ford, which includes a battery test, brake inspection and tire rotation, or read our guide to getting better gas mileage.
Sources
How hybrids work, charge and are built is from the U.S. Department of Energy's Alternative Fuels Data Center and fueleconomy.gov (administered for the U.S. Department of Energy and the EPA), read November 9, 2026. Service details, address and hours are from Michigan City Ford's own website, checked the same day. Photo is illustrative.
- Alternative Fuels Data Center: How Do Hybrid Electric Cars Work?, U.S. Department of Energy Alternative Fuels Data Center (AFDC), read November 9, 2026
- Alternative Fuels Data Center: Hybrid Electric Vehicles, U.S. Department of Energy Alternative Fuels Data Center (AFDC), read November 9, 2026
- fueleconomy.gov, How Hybrids Work, fueleconomy.gov (U.S. DOE/EPA), read November 9, 2026
- fueleconomy.gov, Where the Energy Goes: Hybrids, fueleconomy.gov (U.S. DOE/EPA), read November 9, 2026
- General service: The Works, Michigan City Ford, November 9, 2026
- Address and service hours (structured data), Michigan City Ford, November 9, 2026