Fuel Saving Tips - 2
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5 - RPM range:
In order to use the engine characteristics in the most efficient way, the highest torque range of the engine should be used while driving. Graphs called "Torque graph" show the engine's torque at different rpm. Engines running on gas (petrol), at least the atmospherically aspirated ones, provide their maximum torque at higher rpm, usually, around 3500-4000 rpm. This rpm range is good for starting acceleration (for overtaking), however, the most economical rpm range for cruising is around 2500 rpm, depending on the engine and load conditions. In petrol engines with a turbo (or a supercharger), just like the diesel engines (which all have turbos) the maximum torque is usually provided between 1600 to 2300 rpm. So, they run at higher efficiency at lower rpm and should be driven at these rpm both for performance and fuel economy.

6- In the city:
This is where the fuel consumption is highest because of many stops and slow moving traffic. Leaving a bigger gap with the vehicle at the front and watching the traffic ahead would allow you to take your foot off the accelerator earlier and save some fuel. Every time you brake, the fuel you used to accelerate the car is wasted. Therefore, having a very light right foot is important. Taking your foot off the accelerator when you see the red traffic lights and using the engine braking whenever possible would also save fuel. Some traffic lights may have counters showing how many seconds later the lights would turn green. If it is 25 seconds or more, engine could be turned off and restarted when there are 3-4 seconds to go to save fuel.

7 - Outside the city:
When the road is empty, selecting the highest gear and going at a low rpm would save fuel. As the speed increases, so are the mechanical losses and air drag which would increase the fuel consumption. For example, in some cars, fuel consumption at 100 mph is almost double the consumption at 50 mph. On the highway, you can save 15-20 % fuel by going at 70 mph instead of 80 mph. If it is a 30 mile journey, you would reach your destination only 4 minutes later. Trying to keep a constant speed would also save fuel. Continuously pressing the accelerator pedal and then letting it off would waste fuel. Planning the overtaking maneuvers beforehand and gaining speed before starting the overtaking would be better both for the fuel consumption and safety.

8 - The trip computer:
The trip computer shows the fuel consumption at any given time. With the help of the trip computer, it is possible to adjust the engine speed and the gear selection for the lowest consumption. Trip computers are very helpful devices in helping save fuel. By monitoring the trip computer it is possible to have an idea on fuel consumption in certain situations and after a while it becomes a habit to drive economically.

9 - The cruise control:
Using the cruise control in motorways would help saving fuel by keeping the speed constant and would also allow the driver's right foot to relax. If the cruise control is set to an optimum speed for the fuel consumption and the road conditions, in minimizes the fluctuations in the speed of vehicle and lowers fuel consumption.

DRIVER: The best fuel saving feature
The driver is the most important feature in a vehicle's fuel consumption. There might be up to 20 percent difference between the best and worst drivers of a certain vehicle in terms of fuel consumption. Adopting good driving habits is key in getting more miles for your each cent.