Octane question – acurazine – acura enthusiast community gas x reviews ratings

I really appreciate the input as a new owner and new to the forum. I did find a thread, as suggested by Horseshoez, and in the end think Chojun makes a persuasive statement. Some of the explanations I found were WAY over my head but that’s okay.

While admittedly not educated in the area of fuel, I doubt that there has been some miraculous improvement to 87 octane gas since 2003 to make using it in lieu of the recommended 91 octane advisable or acceptable. Also, while 91 octane here in Nashville hovers around $3/gal, the difference between it and the next level down (89) is maybe 20 cents. While no math wizard, on 1000 gallons of gas that comes out to $200 more I will pay, but mileage might be better, performance should be better and I am guessing any repair I might need as a result of using a lower octane would likely be (as Chojun notes) much more than my lower octane savings.

In the end, I don’t want the "penny wise and pound foolish" label to bite me! My TL already has 235K, has paid its dues so I won’t force it to drink lite beer. Thanks again for the input! Joining this forum was one of the smarter things I have done this year.

I really appreciate the input as a new owner and new to the forum. I did find a thread, as suggested by Horseshoez, and in the end think Chojun makes a persuasive statement. Some of the explanations I found were WAY over my head but that’s okay.

While admittedly not educated in the area of fuel, I doubt that there has been some miraculous improvement to 87 octane gas since 2003 to make using it in lieu of the recommended 91 octane advisable or acceptable. Also, while 91 octane here in Nashville hovers around $3/gal, the difference between it and the next level down (89) is maybe 20 cents. While no math wizard, on 1000 gallons of gas that comes out to $200 more I will pay, but mileage might be better, performance should be better and I am guessing any repair I might need as a result of using a lower octane would likely be (as Chojun notes) much more than my lower octane savings.

In the end, I don’t want the "penny wise and pound foolish" label to bite me! My TL already has 235K, has paid its dues so I won’t force it to drink lite beer. Thanks again for the input! Joining this forum was one of the smarter things I have done this year.A few comments:

I have a ’99 TL. Purchased used in 2003 with 45,000 miles. Car turned 235,000 miles yesterday. Since I’ve owned it, it has only been fed mid-grade gas (89 octane). I live in the Chicago suburbs and do a 60/40 mix of city/highway driving. I get 21 mpg and my mileage and performance has not changed in my 15 years of ownership.

EGR ports were cleaned back at 70,000 miles under the warranty extension. Pulled intake at 200K when doing valve cover gaskets and EGR ports were clean. Spark plugs changed at 105K and 210K and looked brand new each time. Check engine light has come on twice in nearly 200,000 miles. Once a bad coil pack. 2nd time related to the charcoal canister. As far as I’m concerned, 89 octane gas has not hindered mileage, performance, or reliability.

Personally, I wouldn’t think twice about running 89.I find mid-grade 89 octane to be a complete waste of money unless its the minimum requirement. The price is always closer towards 91 premium instead of being split down the middle of 87 and 91 and I’ve never noticed 89 fuel performing any different than 87 regular.

I have a ’99 TL. Purchased used in 2003 with 45,000 miles. Car turned 235,000 miles yesterday. Since I’ve owned it, it has only been fed mid-grade gas (89 octane). I live in the Chicago suburbs and do a 60/40 mix of city/highway driving. I get 21 mpg and my mileage and performance has not changed in my 15 years of ownership.

EGR ports were cleaned back at 70,000 miles under the warranty extension. Pulled intake at 200K when doing valve cover gaskets and EGR ports were clean. Spark plugs changed at 105K and 210K and looked brand new each time. Check engine light has come on twice in nearly 200,000 miles. Once a bad coil pack. 2nd time related to the charcoal canister. As far as I’m concerned, 89 octane gas has not hindered mileage, performance, or reliability.

Personally, I wouldn’t think twice about running 89.A $0.55 difference? Damn. We have a pretty straight 15 cent markup from regular to midgrade to premium here in Utah, which is the primary reason I don’t really fret over using premium despite all the hearsay and arguments. At 30 cents more a gallon I’m only looking at about $200 or less per year. Not really too significant considering that just about any port fuel injected engine with a 11.2:1 compression ratio is going to knock with regular. Heck, I still get occasional knock with 93 and that’s in an engine with zero carbon deposits.