Does higher octane improve mileage?

[Oldtimer]

I know that it is more economical to use the minimum recommended/required octane because, even IF higher octane improves mileage (as it does on some cars) it is not enough of an improvement to offset the higher cost per gallon.
HOWEVER, I would like to know if our vehicles are designed to adapt to higher octane fuel by adjusting the tune (timining) of the engine and thus yielding somewhat better mileage with higher octane gas?
This might be helpful if one's goal was maximizing RANGE on a tank of gas (rather than saving $)

Thanks for any helpful data.

 

[Tellthemride]

I don’t think you would gain much additional mileage. You could always experiment with premium in your next fill up to test the theory.

This page also agrees using premium in a regular recommended car is not necessary.

Premium Gas vs Regular Gas: Which is Best?

Discover the benefits of using premium gas over regular gasoline. Learn which type of fuel is best for your vehicle's performance.

www.truecar.com

 

[Husker Soze]

Not unless you’re comparing an 87 with ethanol vs higher octane without.

 

[Senator20]

Short answer is no.