You probably already know that there are different grades of gasoline, but do you know the difference between them? Unfortunately, if you’re like most drivers, you don’t, which can be problematic when choosing which grade of gasoline to buy. However, understanding the differences between the grades of gasoline can help you figure out which grade will work best in your car, so here’s a rundown of what they are and how they compare.
Fuel Economy Differences
The lower the octane number, the less compression the fuel can withstand before detonating. In some vehicles, lower-octane gasoline will ignite too early in the compression cycle and cause knocking. If you have car trouble caused by knocking, you might be able to solve the problem by switching to a higher grade of gasoline.
Octane Rating Differences
The octane rating of gasoline measures a fuel’s ability to resist knocking or pinging during combustion. The higher the octane rating, the more resistant the fuel is to knocking. Car trouble can occur when using lower-grade gasoline in a car that requires higher-octane fuel. If you’re unsure which grade of gas to use in your vehicle, consult your owner’s manual or ask a qualified mechanic. However, many cars will not require higher octane gasoline. They can run without trouble on the minimum grade octane fuel available. You may notice a slight increase in fuel economy in these cars if you use a higher octane fuel.
Does it Matter Where You Buy Your Gas?
You might have noticed that there are different grades of gasoline and wondered if it matters where you buy your gas. The answer is… maybe. Different brands of gasoline have different amounts of additives that prevent buildup and knocking. If you are unsure which gasoline is best for your vehicle, consult your trusted mechanic for advice.
Should I be Concerned if my Engine Knocks?
Yes, you should be concerned if your engine knocks. Knocking is a sign that the air-fuel mixture in the cylinders is detonating prematurely. This can cause damage to the engine. The higher the octane rating of the gasoline, the less knocking will occur unless other mechanical issues are present.
The choice of gasoline to put in your vehicle is as essential as the mechanic you choose to work on your car. Consult your owner’s manual and talk with your car care professional to help determine which fuel grade and brand are best for your vehicle.
