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  2. Fuel saving device - Wikipedia

    en.wikipedia.org/wiki/Fuel_saving_device

    Underdrive pulleys modify the amount of engine power that can be drawn by accessory devices. Such alterations to the drive systems for alternators or air conditioning compressors (rather than the power steering pump, for example) can be detrimental to vehicle usability (e.g., by not keeping the battery fully charged), but will not impair safety ...

  3. Energy-efficient driving - Wikipedia

    en.wikipedia.org/wiki/Energy-efficient_driving

    If the engine is designed for high octane then higher octane fuel will result in higher efficiency and performance under certain load and mixture conditions. Main article: Battery electric vehicle Battery-electric vehicles use around 20kWh of energy for 100km of travel (equivalent to 3 miles/kWh), about 4 times less than a fossil fuel car.

  4. Not-To-Exceed - Wikipedia

    en.wikipedia.org/wiki/Not-To-Exceed

    For EGR-equipped engines, the engine coolant temperature must be greater than or equal to 125-140 degrees Fahrenheit, depending on intake manifold pressure. Engine after treatment systems' temperature must be greater than or equal to 250 degrees Celsius.

  5. Top Tier Detergent Gasoline - Wikipedia

    en.wikipedia.org/wiki/Top_Tier_Detergent_Gasoline

    Top Tier fuels must maintain levels of detergent additives that are believed to result in a higher standard of engine cleanliness and performance as compared to the United States Environmental Protection Agency (EPA) requirement. In addition, Top Tier fuels may not contain metallic additives, which can harm the vehicle emission system and ...

  6. Car longevity - Wikipedia

    en.wikipedia.org/wiki/Car_longevity

    An automobile is a highly engineered collection of complex components, each of which has its own lifespan and longevity characteristics. The MTBF (mean time between failures) of some components is expected to be smaller than the life of the car, as the replacement of these is considered part of regular maintenance.

  7. Variable compression ratio - Wikipedia

    en.wikipedia.org/wiki/Variable_compression_ratio

    The engine can produce any compression ratio from 8:1 to 14:1. The highest torque is achieved at 8:1, giving high acceleration, while the best gas mileage (fuel efficiency) is achieved at 14:1. The electronic engine controller responds to the pressure on the gas pedal, in real-time, altering the compression ratio seamlessly.

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