What's the Difference Between Regular and Premium Gas?

Regular gas has the lowest octane rating, Premium has a higher octane and Super (or Supreme or Premium Plus) has the highest octane. Octane is the measure of the fuel's ability to resist “knock”. ... Putting premium fuel in a low compression engine or putting regular gas in a high compression engine.

Does premium gas make a difference?

With today's modern fuel-injection systems however, that shouldn't make much difference. Because premium gas has a higher octane rating than midgrade or regular gas, it produces a little more power when burnt. ... In the real world, it barely affects performance, or fuel economy.

What happens if I use regular gas instead of premium?

Using regular gas in an engine that requires premium could void your warranty. That is most likely to happen if using regular causes severe engine knock or pinging (premature ignition of the fuel, also known as detonation) that damages the pistons or other engine parts.