Question

In some countries, a particular fuel is used as an additive to increase the efficiency of petrol.
such a fule is called as.......​

Answer 1

Explanation:

Fuels that are added to petrol or other fuels, to increase fuel efficiency, are known as Fuel Additives. Common Fuel Additives are alcohols such as Methanol (MeOH), Ethanol (EtOH), Isopropyl Alcohol etc. They increase the Octane Rating of petrol, by inhibiting corrosion and providing a lubricating effect.

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Answer 2

In some countries, a particular fuel is used as an additive to increase the efficiency of petrol.

such a fuel is known as gasohol

Explanation:

Many substances are added to petrol in order to increase its efficiency and lubrication. These materials are collectively known as fuel additives.

In many countries, the increasing price of petrol has lead to the use of special fuel known as gasohol, which is a combination of 90% petrol and 10% ethanol which improves the combustion of the fuel and is cheaper.