Question about 1998 Hyundai Elantra

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Premium or regular gas

Should I use regular or premium gas in my 1998 Honda Elantra? (the models to be picked did not include Elantra)

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Fuel comes in different grades due to octane levels, the higher grade the higher octane, the higher price. If you have the owners manual or window sticker, you would see that the car was probably made to run on 87 octane (regular unleaded), I have been through the different octane levels for more than 30 years and I have decided that the cheapest runs as well as the most expensive. The higher octane will sometimes cause an engine to ping or rattle under acceleration, if this happens to yours go back to the cheap stuff and everything will be fine. That is my opinion, others may differ, but I run my BMW on the cheapest I can find and I still get 31 MPG hwy.

Posted on May 20, 2009

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The majority of cars are designed to run on regular gas, and that's what the manuals tell the owners to use. Higher-performance cars often require midgrade or premium gas because their engines are designed for higher compression (higher compression = more power), and regular gas may cause knock. If your car needs high-octane gas, the manual will say so.
For your car the regular gas should be good enough.

Posted on Jun 22, 2009

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Premium is needed to run high compression engines. Because air gets hotter the more it is compressed, regular fuel tends to ignite in a high compression environment because of temperature instead of when it should (gets the spark).

Premium fuel is treated to have a higher temperature flash point so that the hot compressed air doesn't fire the fuel, the spark plug does.

That is why all diesel engines do not require spark plugs -- the temperature of the highly compressed air ignites the fuel. Well, they do have glow plugs that are used for a few moments in order to start on a cold morning.

So, if you don't have a high compression engine, using premium fuel is a waste of money. Hey, it might even run worse on premium fuel

If your engine "needs" premium, it'll tell you when the valves clatter upon acceleration, lets say up a hill.

I think you are probably OK with regular.

Posted on May 20, 2009

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