It varies from state-to-state with regards to laws regulating which octane levels can be listed as premium, mid-grade, or regular. Any gasoline that has an octane level of 91 or higher is considered Premium gas. It is usually labeled pumps as 91 or 93 when visiting gasoline stations. 93 octane gasoline is sometimes labeled as “super-premium” or “ultra.” For octane level of 87 is considered to be “regular” Unleaded gasoline. For 89 octane, several gas stations list this as “mid-grade.” A fuel’s octane is always identified on the gas pump. For the price, the cheapest is the regular-grade gas while premium gas is the most costly.
It may be expected you to test and see if your gasoline choice has an impact on your vehicle’s performance enough that it’s worth the pay for the extra money if your vehicle’s guidebook plainly recommends premium gasoline instead of obligatory using it. To execute this, as close to empty as you dare, get your vehicle’s gas tank (below one quarter of a tank will work), using premium gasoline, fill your vehicle up, and record your gas mileage and any performance notes during your driving through two full tanks of premium fuel, the least. After which, execute the same test on regular fuel or mid-grade, or both. As likely as not, its safe for you to save the money and continue using regular fuel if you don’t notice a difference when using regular or mid-grade fuel.
Doesn’t Mean Better Performance for Higher Octane
The fact is, it doesn’t always give better performance for Higher octane gasoline. In addition to a numeral of other under-the-hood aspects, car performance is dependent on the engine’s technology.
It will not help clean your engine just using a higher octane gasoline. It is required by The U.S. Environmental Protection Agency that all commercially sold gasoline, in aid of helping extend the life of the vehicle to incorporate engine cleaning detergent additives. This signifies the same 87 octane fuel as it will by 93 octane fuel, upon use on your engine will contain the same cleaning property so there’s no need to for your car extra treatment by using a higher grade gasoline.
The gasoline you must use may be stipulated by your vehicle’s warranty. Damage to your vehicle may not be covered if the cause is by using the wrong type of fuel. You’ll closely monitor up to the end of your lease, to what octane you are prescribed to fill your tank with so you do not cause additional expenses if your vehicle is leased.
Remember, for any grade of gasoline, diesel fuel is not an acceptable substitute and this may even cause serious harm to your engine.