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Gasoline Vehicles

Gasoline Vehicles

How modern gasoline engines work, how efficiency is measured, and the maintenance that keeps them running well.

Gasoline engine bay with a fuel nozzle

Understanding fuel efficiency

MPG ratings are measured under standard test cycles and vary with real driving.

  • City, highway, and combined ratings describe different driving patterns.
  • Smooth acceleration, steady speeds, and correct tire pressure help efficiency.
  • Roof racks, extra weight, and idling reduce real-world MPG.

Modern engine technology

Today's engines use several technologies to deliver power more efficiently.

  • Direct injection sprays fuel straight into the cylinder for more precise combustion.
  • Turbocharging lets a smaller engine produce more power when needed.
  • Start-stop systems shut the engine off briefly at stops to save fuel.

Hybrids in between

Hybrids pair a gasoline engine with an electric motor and battery.

  • Conventional hybrids charge themselves through braking and the engine.
  • Plug-in hybrids can drive a limited distance on electricity alone.
  • Both still need regular engine maintenance.

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