Should one use premium gasoline (petrol) or regular?

First, you need to find out what your vehicle's manufacturer recommends. To figure that out, take a look at the owner's manual, where it will be clearly spelled out. Also, there is a sticker inside the fuel door that indicates the fuel requirements for your car. read more

In the USA, at least, "premium gas" refers to gasoline with a higher octane rating than "mid-grade" or "regular" petrol. In my youth it was called "hi-test." And no, "premium gas" is not better than the other blends; it's just different. read more

Vehicles that require premium fuel will have one that says “Premium Unleaded Fuel Only,” with a number that indicates the minimum octane rating. Note that many vehicles have a premium fuel recommendation,but that doesn’t mean that premium fuel is requiredin order to operate without damage to the engine. read more

In the US, since the laws went into effect outlawing lead in gasoline, regular fuel is unleaded fuel. There was a time in the 70’s when regular fuel meant leaded fuel and unleaded fuel had no lead. They were sold side by side for a time. read more