What's the difference between gas grade?

Especially talking about the 85 and the 93 ( usability referred to as special and premium ) . Is there really a significant difference or have I been wasting my money on premium gas?

And for people who knows cars, I have a 2011 Honda Accord SE ( special edition) . Is buying premium gas even necessary for the car? Or would special be at better fit?

Especially talking about the 85 and the 93 ( usability referred to as special and premium ) . Is there really a significant difference or have I been wasting my money on premium gas?

And for people who knows cars, I have a 2011 Honda Accord SE ( special edition) . Is buying premium gas even necessary for the car? Or would special be at better fit?

Thank you so much for your help in advance. Yes, you have been wasting your money every time you put premium fuel in your 2011 Honda Accord which only requires regular 87 octane fuel. Using premium in an engine designed to run on regular will provide no benefit whatsoever. No more power, no better fuel economy, nothing. In fact it may make the engine a little harder to start. The oil companies use the term Premium as a marketing ploy to get people to buy that grade of fuel. It is no more Premium that Regular. It just has a higher octane rating. The octane number of a fuel is a measure of its ability to prevent engine knock and nothing more. You need the higher octane in a high compression engine to prevent engine pinging but in your engine it is not needed. So, stop wasting your money and use Regular fuel. Higher octane gas is more stable and thus resists premature ignition(knocking) in engines which are prone to this, high compression, turbocharged, supercharged, or those which are factory tuned for more performance and require higher octane gas to run optimally. I drive my 3rd Accord, btw. Buying anything more expensive than regular 87 octane is a waste of money, nothing more. If you're interested in keeping your car running clean, use injection cleaner occasionally and get your mechanic to do a throttle-body cleaning every couple of years, but don't buy into they hype of pricier gas for your car. I did however drive a Previa with a supercharged 2.4 liter and that van did run better on premium due to the engine design. Knock resistance. High compression engines need more of it. Check your owners manual to see what is recommended. There's a good chance you only need 87 octane fuel.

Higher octane gas is more stable and thus resists premature ignition(knocking) in engines which are prone to this, high compression, turbocharged, supercharged, or those which are factory tuned for more performance and require higher octane gas to run optimally. I drive my 3rd Accord, btw. Buying anything more expensive than regular 87 octane is a waste of money, nothing more. If you're interested in keeping your car running clean, use injection cleaner occasionally and get your mechanic to do a throttle-body cleaning every couple of years, but don't buy into they hype of pricier gas for your car. I did however drive a Previa with a supercharged 2.4 liter and that van did run better on premium due to the engine design.

Knock resistance. High compression engines need more of it. Check your owners manual to see what is recommended. There's a good chance you only need 87 octane fuel.