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Premium or Regular Unleaded?

 
Old 06-04-2019, 07:52 AM
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Originally Posted by JB in AZ View Post
And yet......on the 2019/2020 RDX Acura "Recommends 91 Octane" and shows a minimum of 87 octane, and warns of engine damage if one uses less than 87. Seems pretty clear to me. Acura wanted to advertise the 272 HP, so to get that, 91 octane is required...very clear and simple.

We're not in 2008 anymore, Toto.
And this combo of 2.0/10 speed is also in the Accord, which calls for regular gas and has slightly lower numbers.

I have switched back to premium. It still feels slightly smoother, even though I admit it might be all in my mind. The difference in price with summer gas around here is not too bad. Sinclair premium is $3.13 and Sunoco regular is $2.95, and they are both Top Tier and within a mile of each other.
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Old 06-04-2019, 11:31 AM
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I've gone through a couple tankfuls of 87 since running only 93 for the first 2500 miles. If I've noticed a difference, it's only because I'm conscious of it. If I didn't know what was in the tank, I probably wouldn't be able to tell by driving it.
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Old 06-04-2019, 01:04 PM
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Originally Posted by Madd Dog View Post
That is totally unfair. Them Coloradans get a pass on smoking pot, their gas gets a pass on lower octane, and their hitters hit baseballs farther.

Is the beer better too?
you have no idea. The state with the most breweries per capita.
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Old 06-04-2019, 07:08 PM
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Originally Posted by Madd Dog View Post
And this combo of 2.0/10 speed is also in the Accord, which calls for regular gas and has slightly lower numbers.

I have switched back to premium. It still feels slightly smoother, even though I admit it might be all in my mind. The difference in price with summer gas around here is not too bad. Sinclair premium is $3.13 and Sunoco regular is $2.95, and they are both Top Tier and within a mile of each other.
$3.13 for premium in NY??
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Old 06-04-2019, 07:28 PM
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Originally Posted by corners View Post
$3.13 for premium in NY??

Yep. At a Sinclair station in the northern suburbs.



Last edited by Madd Dog; 06-04-2019 at 07:30 PM.
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Old 06-04-2019, 07:50 PM
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The Sinclair station and the Mobil station are literally a couple of minutes apart. Look at the price delta.
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Old 06-04-2019, 09:16 PM
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I'm curious.
Does using 87 octane have any effect on the Turbo/DI gas/oil contamination issue?
Would 87 octane lead to a higher amount of unburned fuel in the oil vs 91 or 93?
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Old 06-05-2019, 07:55 AM
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I think 87 burns easier, as octane is a measure of resistance to ignition, higher octane resists ignition and allows for higher compression.

But I think the basic culprit in gas contamination is the fuel getting past the piston rings in the compression cycle rather than any unburned fuel from the power stroke.

But I am not an engineer, and I could be totally right, mostly wrong, or completely wrong, and any point in between.
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Old 06-05-2019, 08:35 AM
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^ Higher octane gasoline is more resistant to compression ignition (the bad kind that causes ping/knock/detonation) - not to spark ignition (the good kind where the flame front starts at the spark plug at the desired time). Once ignited, lower octane gasoline doesn't burn any "easier" or faster.
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Old 06-05-2019, 09:05 AM
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Originally Posted by zroger73 View Post
^ Higher octane gasoline is more resistant to compression ignition (the bad kind that causes ping/knock/detonation) - not to spark ignition (the good kind where the flame front starts at the spark plug at the desired time). Once ignited, lower octane gasoline doesn't burn any "easier" or faster.
I’ve seen stuff like this in other places. Maybe they were not being precise.

https://www.hemmings.com/blog/2014/0...-priced-fuels/
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Old 06-05-2019, 09:44 AM
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Originally Posted by Madd Dog View Post
Iíve seen stuff like this in other places. Maybe they were not being precise.

https://www.hemmings.com/blog/2014/0...-priced-fuels/
Yes good article to read, good share..
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