My best guess is that our new forum member did a copy and paste from the website of the Acura dealership in Monmouth County, NJ.
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From what I can find, it is ~50% more expensive. However, toluene is only good for changing octane whereas ethanol does that and also is an oxygenate. Toluene is also a pretty nasty chemical compared to ethanol.
A copy & paste from the website of an Acura dealer in the Silicon Valley?
He asked you a simple question, imo
Please answer his question and relax yourself
And I am trying to defuse the situation
You may want to think about that 
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Yeah I missed the red bank but never heard of freehold roads. Maybe referring to th3 old national plank turnpikes of something.
I think with a turbo in the rdx, I would use the fuel recommended and also more frequent oil changes. The mdx is still a non turbo last I looked but still want mid range.
I smell spam. If not, please remove the links.
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I referred to a probable copy & paste from the website of a Monmouth County (NJ) Acura dealership because Red Bank and Freehold are two towns in that county.
True but only up to a point. My Saab 9000 had a pretty sophisticated knock sensor system and it still knocked on 87 octane. 89 did the trick except for an occasional little bit of knock when it was really hot.
If you want to get all 1025hp from a 2023 Dodge Demon 170 you have to use E85. Nearly all ethanol as it raises the octane to 100+. Ethanol boosts octane.
Another advantage of E85 is that the latent heat of vaporization is high enough that significantly more fuel can be crammed into the engine than E10 More fuel equals more power and since this is a chemical reaction, it doesnāt matter how hot the engine is.
I just read an article that with engines over about a 10:1 compression ratio that combustion chamber deposits can get hot enough to spontaneously combust any fuel near it unless the octane is higher. Even in the absence of any spark. So if you hear ping or knock use higher octane.
And thus, the invention of a Knock-Sensor which every vehicle the road (that I know of) has one.
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Carbureted vehicles with carbon buildup in high compression engines would ādieselā. Meaning the would continue to run after ignition was turned off. I had one, a ā70 Cutlass with a high compression 350 purchased used. My solution was to shift to reverse then turn of ignition. Though still in the double nickel days, several interstate runs helped clear out some of the carbon build up.
+1
I taught a few of my friends to do that.
What Iām trying to say is in this case the knock sensor would have no effect. You can regard the timing all you want and it will still knock because the spark plugs didnāt initiate combustion. The cylinder deposits did.
While I respect what the folks here say, Iāve always used the mid grade since new in my Acura. No problems. Maybe a waste but so is coffee.
Doesnāt Acura recommend premium gasoline? The 2019 RLX ownerās manual says that mid grade might lead to occasional knocking and regular 87 octane could result in engine damage.
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The book says 91 octane. Not sure what the mid grade is. Only other option would be the non oxy premium for boats etc. Iāll have to look next time but not been a problem so far.
And what Iām saying is - Thatās not true. 10:1 compression ratio is not considered very high and can easily run on regular gas. When you get up around 12:1 is when you start to really need to run exclusively on higher octane.