Drivers urged to turn on little-known car feature that saves fuel

Woolwich resident says petrol prices are 'astronomical'

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The prices of both petrol and diesel still remain fairly high. The latest RAC Fuel Watch indicates that drivers will have to pay 169.58p per litre of unleaded and 182.36p per litre of diesel on average. The forecast also predicts that both prices should fall down further.

However, in the meant time, drivers are being urged to turn on a little-known car feature called Intelligent Speed Assistance (ISA).

The ISA is a technology that uses video cameras or GPS-linked speed limit data to help drivers stay within the speed limit indicated by road signs.

Once the speed limit is detected, the ISA system will provide a warning to the driver if they exceed the posted speed.

In newer cars, drivers can choose when they want the warning to sound. This could be as soon as they reach the maximum speed limit or if they go over by 5mph.

As soon as the warning sounds, motorists will be able to decide whether they want to slow down or ignore the advice.

However, keeping the system off or ignoring its advice can lead to increased fuel consumption.

This is because speeding uses more fuel than driving at a steady, legal pace.

The RAC added that driving at a constant speed is crucial when attempting to save petrol and diesel.

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The experts believe that driving at 45 – 50mph is the most efficient speed for fuel consumption, not the “56mph myth” many have been adhering to.

This in turn means that anyone who chooses to go over the speed limit will not only break the law but also waste a considerable amount of fuel and money.

It is therefore beneficial for drivers to keep the ISA on at all times.

The system seems to be quite accurate but there are a few factors that can affect its precision, according to experts.

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Poor GPS signal quality can affect the system that relies on GPS data for speed limit information.

This is usually not a problem in urban areas but can be an issue in rural areas with a weaker GPS signal.

ISA systems that use video cameras can be impacted by their placement. If the cameras are placed incorrectly, they may not accurately detect speed limit signs.

Weather can also impact ISA systems. If a road is wet, icy, or covered in snow, the ISA system may misread the speed limit.

While keeping to the speed limit, motorists have also been urged to drive in the highest gear possible.

By using the highest gear, drivers can also boost their fuel economy.

Excessive speed is the biggest fuel-guzzling factor, with motorists being urged to have a light right foot.

This will ensure all acceleration is gentle, which is very important to fuel-efficient driving.

In urban areas, drivers are advised to change up through the gears as quickly as they can with the lowest revs possible.

The faster the engine spins, the more fuel the vehicle uses.

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