Use fuel with the rating recommended by your vehicle manufacturer. a ) converter b) emission c) exhaust d) octane

The answer is D: Octane

Octane rating is the fuel’s ability to resist “knocking” during combustion. Octane rating depends on what is recommended for your car’s engine by the manufacturer. For example, in the United States, the regular unleaded gasoline has typical octane ratings of between 87 (regular) to 90 (mid-grade). This is the cheapest and most standard option at the pump. The octane rating on gasoline pumps is prominently displayed on a yellow background in large black numbers. To help yourself determine your vehicle’s octane rating, always read the car’s manual to see the recommendations of the manufacturer.

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