Can 89 Octane gets better gas mileage?

[dr150]

Do you guys know that tankers add the WRONG fuel to the gas station's tanks?????????

If a tanker has 87 octane left in his rig after topping off, he'll put the rest into the 89 or 91 tanks!!....And vice-

versa.

IT IS VERRRY LIKELY THE HIGHER OCTANE GASES HAVE BEEN DILUTED BY THE LOWER OCTANE FUEL...

 

[conjur]

I'll use 89 octane if the temps will be consistently above 90F and I plan on doing a lot of city driving. Otherwise, 87 only.

 

[Ipno]

Filling up on premium increases your fuel efficiency because after wasting that money you have less money to spend going out, so you go out less.

 

[gsellis]

Ronstang wins

BTW, 89 octane is not 89 octane... Octane is calculated in enough different was that what might be 87 octane by one method, may be 90 by another. One common method of calculating octand is take a mechanical measure (derived on a device that measures it, we had a single piston engine with a knock sensor and adjustable compression in the ME lab) and the research method (content is calculated by formulation) and then divide by 2. You will see this as (R+M)/2 on the label. 0 Octane compares to Heptane. 100 Octane compares to IsoOctane (it is a scale). So, your manual may say 89, but it may also be mechanical only. Don't you just love variable standards?

Octane has NOTHING to do with BTU as it is how it compares to the behavior of heptane and isooctane. Some lower octane formulations may have more BTU, but then again, they may not. Throw some nitromethane into the mix if you want to mess with output and higher octane.

 

[gsellis]

Originally posted by: Ipno
Filling up on premium increases your fuel efficiency because after wasting that money you have less money to spend going out, so you go out less.

 

[MercenaryForHire]

Originally posted by: dr150
Do you guys know that tankers add the WRONG fuel to the gas station's tanks?????????

If a tanker has 87 octane left in his rig after topping off, he'll put the rest into the 89 or 91 tanks!!....And vice-

versa.

IT IS VERRRY LIKELY THE HIGHER OCTANE GASES HAVE BEEN DILUTED BY THE LOWER OCTANE FUEL...

404 Proof Not Found.

Now go back to P&N, since your cries of Sky+Falling seem to suggest that is your origin.

Alternatively, soak yourself in gasoline, strike a match, and DIAF.

- M4H

 

[Insane3D]

Originally posted by: IonYou

Originally posted by: Ronstang

Originally posted by: IonYou
Higher octane gasoline burns slower. Doesn't matter if it is ignited by spark or not.

That is what I said.

I know but I just wanted to back up what you were saying in case Insane3d didn't believe you. He kept insisting that everything he's read about octane is it increases resistance to ignition from compression...not from a artificial source like a spark.

I was insisting? I simply said I understood it differently. So far, neither of you has offered me any proof, so I guess I'm just taking your word for it?

:roll:

 

[gsellis]

Originally posted by: dr150
Do you guys know that tankers add the WRONG fuel to the gas station's tanks?????????

If a tanker has 87 octane left in his rig after topping off, he'll put the rest into the 89 or 91 tanks!!....And vice-

versa.

IT IS VERRRY LIKELY THE HIGHER OCTANE GASES HAVE BEEN DILUTED BY THE LOWER OCTANE FUEL...

Most fuel trucks I have seen have different tanks in the same rig.

Oh, myth, Shell/Amoco/Citgo gas are different/better. Each put fuel into the pipeline, say 1million gallons of 87 octane. They now can get 87 octane from the end of the pipeline. It will take 2 weeks for what they put in to get to the endpoint. IOW, 87 octane could have been made by anyone and it is all the same (depending on the required formulation). AFTER it is delivered does it become different. Once they take it on the receiving end, they add their additives that make it different. So Citgo 87 = BP/Amoco 97. Just the additives are different.

 

[dirtboy]

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?

I'd say the opposite is true.

 

[captains]

if goin on a long trip (all highway) i heard the higher octane give u better milage, if its normal stop and goin then there is pretty much no change.

sunoco's in CT have no more 94 because of a change in the law having to do with ethanol, dont know if it was for everybody but definitly no more 94 in CT