What is the difference between gas grades

When using non-ethanol gasoline, my mileage goes up to the 23 to 27 mileage. What about 85 octane? Which is the best gas for ur car if a mechanic tell u u get the high percentage for ur car to help clean gas line out.

I thought that octane was gasolines ability to hold oxygen therefore at higher elevations where the air is thinner the gasoline cannot hold as much oxygen resulting in a lower octane rating. Is this correct? When your cars engine with carburetor is tuned for sea level driving, the gasoline octane rating should be determined on the compression ratio of the engines combustion chamber.

The carbureted engine will start to smoke black smoke, too much fuel and start running erratically! Old hot rodders such as myself always carry a case with different sized main jets, and stop before the erratic behavior begins.

This is where you better have knowledge of how to disassemble your carb and reassemble it after changing jets. You want less fuel and more air, then a timing light to retard your distributors spark a few degrees. She has a Master's Degree in Chemistry from the University of Oregon and has previously worked in the pharmaceutical industry and has taught at the middle school, high school, and college levels. Regular gas: 87 octane rating, average 85 to 88 Mid-grade or plus gas: 89 octane rating, average 88 to 90 Premium gas: 92 octane rating, average 91 to How Is Propane Made?

What Is Butane Fuel? The Disadvantages of Using Gasohol as an Alternative What Is Diesel Fuel? Chemical Formula for Propane. Types of Gas Welding. Specifications of the E-Z-Go Engine. The Manufacturing Process of Rubber. Alternative Fuels Used in Vehicles. How to Calculate Wobbe Index. There are three different types of gas at most U.

You might also see the different gas grades referred to as unleaded, super, or super-premium. Using the right fuel for your vehicle can boost its performance and efficiency. It could even potentially damage your vehicle if you fill up with the wrong type of gas. The main difference between premium gas and regular gas is the octane rating. Regular unleaded gas is typically the cheapest gas to purchase, as it is the most common.

Research by AAA found that these vehicles saw a slight increase in performance and fuel economy using premium gas. Depending on what and how you drive, commuters looking to get from Point A to Point B may not notice the difference or care. At the end of the day, it all comes down to your preference. Your car, your rules. Type: Car Ownership. Published: January 11, So, what's the difference between premium and regular gas? If your car only recommends premium, the choice is yours.