Can 89 Octane gets better gas mileage?

[VIAN]

From what I know about what octane does, it doesn't seem possible that 89 would boost gas mileage compared to 87 unless the car manufacturer recommends 89 due to less engine knocking. But I've heard a few people say they've experience better gas mileage from getting 89. Is there any truth to it?

 

[Goosemaster]

dude. rtfm. live by it.

 

[PurdueRy]

you will be best served by using what is recommended

 

[EKKC]

i would buy 80 octane gas if it exists and cost less than $3.

gas prices gas prices gas prices gas prices gas prices...

 

[rmrf]

Originally posted by: EKKC
i would buy 80 octane gas if it exists and cost less than $3.

gas prices gas prices gas prices gas prices gas prices...

and your car would wear out 10x faster than mine

 

[imported_goku]

What happened to 91 octane? You guys should keep in mind that higher octane gas is better for the environment than lower octane because 1. more complete combustion and 2. It also doesn't leave carbon deposits on your engine/tailpipe.

 

[Insomniak]

Originally posted by: VIAN
From what I know about what octane does, it doesn't seem possible that 89 would boost gas mileage compared to 87 unless the car manufacturer recommends 89 due to less engine knocking. But I've heard a few people say they've experience better gas mileage from getting 89. Is there any truth to it?

IIRC your fuel injector is going to spray the same amount of fuel into the cylinder chamber per rotation no matter what kind of gas you fill the tank with. So no, you'll get the same number of RPMs per tank no matter your octane rating.

I can see higher octane gas providing more *power* due to better combustion and thus higher energy output, but not more mileage.

 

[DAGTA]

What I find odd is that you can buy 93 octane in Indiana but I have never seen higher than 91 octane in Phoenix.

 

[EKKC]

Originally posted by: rmrf

Originally posted by: EKKC
i would buy 80 octane gas if it exists and cost less than $3.

gas prices gas prices gas prices gas prices gas prices...

and your car would wear out 10x faster than mine

where do trucks fill up their tanks? i never see 18 wheelers fill up at gas station. they using some low-grade 40-octane diesel thing?


edit: does sunoco or whatever sitll have their ULTRA 94? (remember the joke with the Nintendo 64 then called ULTRA 64?) does it now cost like, 5 bucks a gallon?

 

[sleuth bandit]

Originally posted by: goku
What happened to 91 octane? You guys should keep in mind that higher octane gas is better for the environment than lower octane because 1. more complete combustion and 2. It also doesn't leave carbon deposits on your engine/tailpipe.

You have no idea what you're talking about. I hope you're being sarcastic.

 

[MDE]

Originally posted by: Insomniak

Originally posted by: VIAN
From what I know about what octane does, it doesn't seem possible that 89 would boost gas mileage compared to 87 unless the car manufacturer recommends 89 due to less engine knocking. But I've heard a few people say they've experience better gas mileage from getting 89. Is there any truth to it?

IIRC your fuel injector is going to spray the same amount of fuel into the cylinder chamber per rotation no matter what kind of gas you fill the tank with. So no, you'll get the same number of RPMs per tank no matter your octane rating.

I can see higher octane gas providing more *power* due to better combustion and thus higher energy output, but not more mileage.

Plus any kind of trivial mileage boost is definately not worth the extra 10 cents a gallon.

 

[rmrf]

Originally posted by: EKKC

Originally posted by: rmrf

Originally posted by: EKKC
i would buy 80 octane gas if it exists and cost less than $3.

gas prices gas prices gas prices gas prices gas prices...

and your car would wear out 10x faster than mine

where do trucks fill up their tanks? i never see 18 wheelers fill up at gas station. they using some low-grade 40-octane diesel thing?

 

[Insomniak]

Originally posted by: MDE

Originally posted by: Insomniak

Originally posted by: VIAN
From what I know about what octane does, it doesn't seem possible that 89 would boost gas mileage compared to 87 unless the car manufacturer recommends 89 due to less engine knocking. But I've heard a few people say they've experience better gas mileage from getting 89. Is there any truth to it?

IIRC your fuel injector is going to spray the same amount of fuel into the cylinder chamber per rotation no matter what kind of gas you fill the tank with. So no, you'll get the same number of RPMs per tank no matter your octane rating.

I can see higher octane gas providing more *power* due to better combustion and thus higher energy output, but not more mileage.

Plus any kind of trivial mileage boost is definately not worth the extra 10 cents a gallon.

I agree. In the end, it's a net economic loss.

 

[FoBoT]

uh

 

[Ronstang]

Originally posted by: sleuth bandit

Originally posted by: goku
What happened to 91 octane? You guys should keep in mind that higher octane gas is better for the environment than lower octane because 1. more complete combustion and 2. It also doesn't leave carbon deposits on your engine/tailpipe.

You have no idea what you're talking about. I hope you're being sarcastic.

Thank you for not making me the first person to say that. Please educate yourself before you open your piehole goku. You are one of those people who will repeat whatever they hear, huh?

 

[wiredspider]

Use the MFR recommended stuff..

 

[Ronstang]

Originally posted by: Insomniak

Originally posted by: MDE

Originally posted by: Insomniak

Originally posted by: VIAN
From what I know about what octane does, it doesn't seem possible that 89 would boost gas mileage compared to 87 unless the car manufacturer recommends 89 due to less engine knocking. But I've heard a few people say they've experience better gas mileage from getting 89. Is there any truth to it?

IIRC your fuel injector is going to spray the same amount of fuel into the cylinder chamber per rotation no matter what kind of gas you fill the tank with. So no, you'll get the same number of RPMs per tank no matter your octane rating.

I can see higher octane gas providing more *power* due to better combustion and thus higher energy output, but not more mileage.

Plus any kind of trivial mileage boost is definately not worth the extra 10 cents a gallon.

I agree. In the end, it's a net economic loss.

And none of you have any idea how an internal combustion engine really works or know anything about how octane affects them now do you? You guys are simply wrong.

 

[EKKC]

Originally posted by: Ronstang

Originally posted by: Insomniak

Originally posted by: MDE

Originally posted by: Insomniak

Originally posted by: VIAN
From what I know about what octane does, it doesn't seem possible that 89 would boost gas mileage compared to 87 unless the car manufacturer recommends 89 due to less engine knocking. But I've heard a few people say they've experience better gas mileage from getting 89. Is there any truth to it?

IIRC your fuel injector is going to spray the same amount of fuel into the cylinder chamber per rotation no matter what kind of gas you fill the tank with. So no, you'll get the same number of RPMs per tank no matter your octane rating.

I can see higher octane gas providing more *power* due to better combustion and thus higher energy output, but not more mileage.

Plus any kind of trivial mileage boost is definately not worth the extra 10 cents a gallon.

I agree. In the end, it's a net economic loss.

And none of you have any idea how an internal combustion engine really works or know anything about how octane affects them now do you? You guys are simply wrong.

its the same as arguing if a DDR 667mhz RAM will be better than DDR533

 

[Insomniak]

Originally posted by: Ronstang

Originally posted by: sleuth bandit

Originally posted by: goku
What happened to 91 octane? You guys should keep in mind that higher octane gas is better for the environment than lower octane because 1. more complete combustion and 2. It also doesn't leave carbon deposits on your engine/tailpipe.

You have no idea what you're talking about. I hope you're being sarcastic.

Thank you for not making me the first person to say that. Please educate yourself before you open your piehole goku. You are one of those people who will repeat whatever they hear, huh?

I'm kind of confused too. Is incomplete combustion when a molecule half-reacts?

I think what he meant was higher grade fuels have higher hydrocarbon content and thus produce more energy when combusting per volume unit. Although I'm not sure what the hell that has to due with environmental changes or "carbon deposits".

 

[sleuth bandit]

Originally posted by: Insomniak

Originally posted by: Ronstang

Originally posted by: sleuth bandit

Originally posted by: goku
What happened to 91 octane? You guys should keep in mind that higher octane gas is better for the environment than lower octane because 1. more complete combustion and 2. It also doesn't leave carbon deposits on your engine/tailpipe.

You have no idea what you're talking about. I hope you're being sarcastic.

Thank you for not making me the first person to say that. Please educate yourself before you open your piehole goku. You are one of those people who will repeat whatever they hear, huh?

I'm kind of confused too. Is incomplete combustion when a molecule half-reacts?

I think what he meant was higher grade fuels have higher hydrocarbon content and thus produce more energy when combusting per volume unit. Although I'm not sure what the hell that has to due with environmental changes or "carbon deposits".

Seriously, please stop talking. Use google for 3 seconds.

 

[Frosty3799]

yikes...

start here

Use what your car manufacturer recommends, and no less grade. Modified engines, such as those turbo'ed or supercharged wil require higher grade octanes because the air entering the cylinders is already compressed...

 

[Ronstang]

Originally posted by: sleuth bandit

Originally posted by: Insomniak

Originally posted by: Ronstang

Originally posted by: sleuth bandit

Originally posted by: goku
What happened to 91 octane? You guys should keep in mind that higher octane gas is better for the environment than lower octane because 1. more complete combustion and 2. It also doesn't leave carbon deposits on your engine/tailpipe.

You have no idea what you're talking about. I hope you're being sarcastic.

Thank you for not making me the first person to say that. Please educate yourself before you open your piehole goku. You are one of those people who will repeat whatever they hear, huh?

I'm kind of confused too. Is incomplete combustion when a molecule half-reacts?

I think what he meant was higher grade fuels have higher hydrocarbon content and thus produce more energy when combusting per volume unit. Although I'm not sure what the hell that has to due with environmental changes or "carbon deposits".

Seriously, please stop talking. Use google for 3 seconds.

Yeah, he is confused also.

 

[Insane3D]

http://auto.howstuffworks.com/question90.htm

All extra octane does is increase the flash point of the gas when it's compressed. 93 octane fuel can be compressed more before it ignites from compression than 87 octane. This is only useful in cars that have a higher compression ratio, and call for it. Putting higher octane fuel in a vehicle that requires 87 is useless and a waste of money.

For example, my Mustang calls for 87 octane from the factory, but I replaced the heads with high performance aluminum ones that raised the compression, so I now need the higher octane stuff to keep from detonating.

Octane has no effect on mileage...

Hope this clears things up...

Edit:

Frosty beat me to it...

 

[Shawn]

no

 

[dartworth]

i just don't think so...