Does High Octane gas burn less than regular fuel? (idle, mileage, engines)

[Blackandgold51]

Does Premium High Octane burn less similar to diesel?

[rbohm]

no. any gasoline engine can run any gasoline, but they use it at the same rate, no more, no less. the only reason to run a higher octane fuel is to prevent detonation.

diesel engines run much higher compression, and as a result the rotating assembly is heavier than the typical gas engine assembly. as a result they dont need as much force to keep them in motion compared to a gas engine. thus diesels dont need to use as much fuel to maintain an idle, or any other rpm.

also note that with the higher compression in the diesel, you dont need an ignition system to fire the fuel, it starts burning the instant it is injected into the cylinder due to the heated air. and since that occurs, you again dont need as much fuel compared to a similar gas engine.

engine design is much more important than fuel octane, or in the case of diesel, cetane.

[gunslinger256]

higher octane = less likely to spontaneously ignite under high compression

[iTsLiKeAnEgG]

The only benefit to a higher octane is greater knock resistance. If your engine cant take advantage of more knock resistant fuel there is no benefit to using it.

[Me007gold]

Do you really need a make a 3rd thread on this topic? What was wrong with your other two threads?

[unit731]

Originally Posted by Me007gold

Do you really need a make a 3rd thread on this topic? What was wrong with your other two threads?

Correct.

This is the 3rd thread on same question.

[Blackandgold51]

Originally Posted by Me007gold

Do you really need a make a 3rd thread on this topic? What was wrong with your other two threads?

I thought my thread didn't go through

[Suncc49]

[Labonte18]

Technically.. Higher octanes might get you greater fuel mileage because some stations, the higher octanes do not contain ethanol.

That would be in comparison to regular unleaded, however.. Not to diesel.