Octane and Mileage

[PhiloCruiser]

you all find a difference in the mileage you get with a higher octane gas vs a lower? I ask because I recently completed a 2000 mile trip and was forced to purchase 88 octane vs the 91-93 I had been using. The difference on the mileage computer was nearly 2 mpg BETTER with the lower octane gas, from tank to tank.

This was a stretch of I-35 and fairly flat where I was. Nothing significant enough to make that kind of a difference...and my speed was consistent.

Clearly, this isn't a scientific study and I'm sure there are other things to think of...but i'm curious if others have found a difference.

 

[Markuson]

Go Here:
87 vs 91 Octane: LC vs LX570

And here:
Poll - LX570 owners using regular 87 octane or Premium

Once you read through those two threads, you will see the question has been beaten to death...and you’ll likely feel you’ve been beaten to death as well!

 

[NMC_EXP]

If the higher octane of your normal gas was due to higher ethanol content, better mpg with the lower octane makes sense.

Ethanol is a lousy fuel.

 

[Docboy]

Here we go again

 

[CGP]

I made the same trip (Cincinnati to Cleveland) twice in a month and got 1 mpg less with 93 than i did with 87. Going forward i am going to continue to mix it up and see if i get the same results or if it was an anomaly.

 

[Sandroad]

An octane question.......there be dragons......

Here are a few of the 470 search hits with "octane". Some appear to be the same, but are different posts.

Poll - LX570 owners using regular 87 octane or Premium

87 vs 91 Octane: LC vs LX570

I Don't HaveTime to Research This (Warning - Octane Related!)

Fuel requirements at altitude

How bad is your gas mileage?

5.7 LX - LC fuel - Regular or Premium?

Fuel Requirement

87 vs 91 Octane: LC vs LX570

Poll - LX570 owners using regular 87 octane or Premium

 

[PhiloCruiser]

my bad...didn't search well enough...thank you for the links...that said, I avoid ethanol at ALL costs. Thanks for the help.