Manual: 2013/2014 911

Page: 206

In addition, carbon monoxide (CO) and oxides of nitrogen (NOx) contribute to engine emissions. They, too, are formed during the combustion process and discharged into the exhaust system.

To reduce these pollutants, your Porsche is equipped with a precisely calibrated fuel injection system to assure a finely balanced air/fuel mixture under all operating conditions.

Oxygen sensor
The oxygen sensor, installed in the exhaust pipe continuously senses the oxygen content of the exhaust and signals the information to an electronic control unit. The control unit corrects the air/fuel ratio, so the engine always receives an accurately metered air/fuel mixture.

Crankcase ventilation
Through crankcase ventilation, undesirable emissions from the engine crankcase are not permitted to reach the outside atmosphere. These emissions are recirculated from the crankcase to the air intake system. From here the emissions mix with the intake air and are later burned in the engine.

Catalytic converters
The catalytic converters are efficient "clean-up" devices built into the exhaust system of the vehicle. The catalytic converters burn the undesirable pollutants in the exhaust gas before it is released into the atmosphere.

The exclusive use of unleaded fuel is critically important for the life of the catalytic converters. Therefore, only unleaded fuel must be used.

The catalytic converters will be damaged by:
– Push or tow starting the vehicle,
– Misfiring of the engine,
– Turning off the ignition while the vehicle is moving,
– Driving until the fuel tank is completely empty,
– By other unusual operating conditions.

  • Do not continue to operate your vehicle under these conditions, since raw fuel might reach the catalytic converters. This could result in overheating of the converters. Federal law prohibits use of leaded fuel in this car.

Fuel Economy
Fuel economy will vary depending on where, when and how you drive, optional equipment installed, and the general condition of your car.

A car tuned to specifications and correctly maintained, will help you to achieve optimal fuel economy.

  • Have your vehicle tuned to specifications. Air cleaner should be dirt free to allow proper engine "breathing".
    Battery should be fully charged.
    Wheels should be properly aligned.
    Tires should be inflated to the correct pressure.
  • Always monitor your fuel consumption.
  • Drive smoothly, avoid abrupt changes in speed as much as possible.
  • Avoid jack rabbit starts and sudden stops.
  • Do not drive longer than necessary in the lower gears. Shifting into a higher gear early without lugging the engine will help save fuel.
  • Prolonged "warm up" idling wastes gas. Start the vehicle just before you are ready to drive.
    Accelerate slowly and smoothly.
  • Switch off the engine if stationary for longer periods.
  • Any additional weight carried in the vehicle reduces fuel economy. Always keep cargo to a minimum and remove all unnecessary items.
  • Organize your trips to take in several errands in one trip.
  • All electrical accessories contribute to increased fuel consumption.
  • Only switch on the air conditioning when necessary.
  • Do not drive with the Roof Transport System mounted unless you need it.

The EPA estimated miles per gallon (mpg) is to be used for comparison purposes, actual mileage may be different from the estimated mpg, depending on your driving speed, weather conditions and trip length. Your actual highway mileage may be less than the estimated mpg.

  • Please observe all local and national speed limits.