Curious if milage is any better, the local Wawa just started carrying it in 89 octane..I'm giving it a shot

 

We have it in Hughes stations up here. No measurable difference in mileage or performance. YMMV

 

I always use ethanol free 91 octane. Most of the "premium" around here is ethanol free now, but it's crazy expensive. $0.70 more per gallon than regular.

I can't compare to regular 10% ethanol, cuz I've never used it in this vehicle, but is 21-22 mpg around town and 23 on the Interstate "better"? Mostly, I blame my hyperactive right foot.

Anyway, at my local prices there is absolutely no financial benefit to using ethanol free premium. YMMV

 

There is more energy, volume for volume, in gasoline than in ethanol. But I doubt how measurably different it is in the real world.

 

My wife claims she can tell the difference in responsiveness of her MDX depending on whether it gets ethanol free premium or the diluted stuff. Who am I to argue?

I have no clue how much difference there would be in instrumented tests, but it could be argued that subjective "feel" is more important for a luxury vehicle that is unlikely to find its way onto a race track.

As for my RDX, if the "good stuff" has any mitigating effect on the occasional "stumbles" of the drivetrain, it's money well spent. My tolerance for such misbehavior is low. YMMV

 

I've only tried it once because it's only available at 94 octane where I live, and the price bump from 91 octane E10 is pretty severe. Didn't notice enough difference in performance or efficiency to justify paying the price premium.

 

Petro Canada? I believe that still has ethanol.

 

Chevron. Some stations have a separate nozzle that only dispenses 94 octane E0.

 

Heh, thanks for that. I'll look around and try to find some.

 

And I saw "...FREE gas" !!!!

Guess I need new glasses!

 

I only use Meijer Gas because it is 100% Gas.

I have not tested 10% E on my RDX, but I did extensive testing on my two Honda Accords. With Meijer Gas, I got 2-3mpg better each time (compared to Shell or BP).