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First, I know that premium fuel does not equal to higher HP and it's a waste of money for a car that uses regular 87 gas.

However, when searching the web, I found out that our V6 is the same engine as the one under the hood of the Acura MDX....and with the same 11.5:1 compression ratio. They're rated at 280HP on 87 gas on the Honda side and 290HP when using 91 octane gas on the Acura side...:unsure::unsure::unsure:

Does our ECU in our Passport (and others Honda trucks that uses the J35Y6 engine) has the ability to advance its timing?

FYI, my old 2.0L Ecoboost in my Escape makes 230HP on regular and 240HP with 93 octane gas because various owners of Ecoboost engines has confirmed that those ECUs can change its timing for more power when it detects a higher grade of gas. (e.g. search for Ecoboost Mustang HP rating and you'll see what I mean ;) )
 

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Can't speak for the Passport but I know for the current gen Civic hatchbacks with the 1.5T, the sport model wants better gas and advertises higher power vs. the regular version. Met the Hondata guy once and he told us the engine tune is actually the same between sport and regular models, it's purely a fuel quality thing that dictates the power output.

If Honda is running the same engine in both cars, I wouldn't be surprised if they left the tune the same and let the octane sensor determine output.
 

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Would be fantastic if someone with easy access to a dyno could test this. I'm tempted to spend a bit for some dyno runs for the greater good. Seems like it would be as simple as doing a run on 87. Then doing a second run a week later with a tank full of 91.
 

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That’s interesting that both engines have the same compression ratio. I feel like Honda says to use 87 for non-Acura’s because Nana would have a heart attack if she had to put premium in her Pilot ?

Sam’s Club premium is the same price as regular at normal gas stations so it doesn’t hurt to try.
 

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First, I know that premium fuel does not equal to higher HP and it's a waste of money for a car that uses regular 87 gas.

However, when searching the web, I found out that our V6 is the same engine as the one under the hood of the Acura MDX....and with the same 11.5:1 compression ratio. They're rated at 280HP on 87 gas on the Honda side and 290HP when using 91 octane gas on the Acura side...:unsure::unsure::unsure:

Does our ECU in our Passport (and others Honda trucks that uses the J35Y6 engine) has the ability to advance its timing?

FYI, my old 2.0L Ecoboost in my Escape makes 230HP on regular and 240HP with 93 octane gas because various owners of Ecoboost engines has confirmed that those ECUs can change its timing for more power when it detects a higher grade of gas. (e.g. search for Ecoboost Mustang HP rating and you'll see what I mean ;) )
Interesting side note, ford reccomends premium for the ecoboost 1.5 and the 2.0 hybrid. 1.5 I understand because of the turbo,but a naturally aspirated engine on the atkinson cycle??
 

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I had a 2018 Chevy Equinox with the 2.0 turbo. "Recommended" fuel was 91 octane, although it would run fine on 87 or 89. Those smal turbo engines apparently need high octane fuel to meet the advertised HP rating. BTW I had the Equinox for less than a year. After a few months I realized what a POS it was and I remembered why I hadn't had a domestic brand vehicle since 1993.
 
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