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Old 05-26-2022, 09:39 PM   #15
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All I can say is that my 8.1L does not like 85 octane when I have tried it out west in the mountain states, I get knocking issues even at elevation, and end up stopping in the next town to top off with 89 or 91 octane to fix the problem.
If your 8.1L GM engine has an audible knock it is broken and should be fixed! For unknown reasons the computer for our engine is not adjusting timing and air fuel ratios to eliminate knock.
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Old 05-28-2022, 08:57 AM   #16
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Thanks for the reply. We're out of the mountains so 87 octane pretty much standard. When we head back to SoCal, I'm going to try 85 when at higher elevations. Not sure I'll be able to hear engine knock since engine and fan noise can be significant. We have a blue tooth OBD reader and will try to monitor. Just not sure it will give us the necessary info. We'll try and see what happens.
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Old 05-28-2022, 09:10 AM   #17
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Thanks for the reply. We're out of the mountains so 87 octane pretty much standard. When we head back to SoCal, I'm going to try 85 when at higher elevations. Not sure I'll be able to hear engine knock since engine and fan noise can be significant. We have a blue tooth OBD reader and will try to monitor. Just not sure it will give us the necessary info. We'll try and see what happens.
If your engine electronic systems are healthy you won't hear knock. The knock sensors are much more sensitive than your ears. Engine parameters will be adjusted before any audible knock occurs.

If you have left over 85 Octane in your tank when you get to lower elevation the engine control systems will assure your engine is not damaged. The engine will make slightly less power until 87 Octane fuel replaces the 85 Octane in the tank.
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Old 05-28-2022, 06:52 PM   #18
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Besides octane rating, the biggest difference will be the brand of gasoline purchased. Top Tier is the best quality; and yes it does make a very noticeable difference in my Silverado 5.3 engine, between filling up at Sams Club and BP with 87 octane.
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Old 08-12-2022, 10:59 PM   #19
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I don't mean to revisits an old thread, but you guys use nothing but 87 octane and up gas in your motorhome.
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Old 08-13-2022, 07:08 AM   #20
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I don't mean to revisits an old thread, but you guys use nothing but 87 octane and up gas in your motorhome.
I'm not sure what you are saying. Are you asking if all of us always use 87+ octane all the time? If so the answer is it depends. I live at 7000' elevation and in almost all my travels I never get below 3500' elevation. I always use the lowest octane fuel available at the pump. Often at 3500' that will be 87 Octane. But most of the time I use 87 Octane.

Others who responded to this thread say they use 87 or 91 Octane regardless of where they are. I say not switching to lower Octane fuel at higher elevations is costing money and has no other discernable affect!
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Old 08-13-2022, 10:53 PM   #21
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Yes pretty much after I had type that I went and look in my manual and it said to use 87 Octane or even you can use 91 Octane.
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Old 08-14-2022, 07:06 AM   #22
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I don't think 85 octane is even available in the northeast where I drive. If it was I would use it. Truck engines used to be designed to haul heavy loads on cheap gas. Maybe the modern engines are more finicky trying to use more compression for better fuel economy.
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Old 08-14-2022, 12:18 PM   #23
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When I first bought my MH on the way back I think I put 87 Octane in it but it was only a few gallons but not I will make sure that it 87 and above.

My new 2022 ram take diesel and my last three ram was diesel so now I have to make sure I get the higher unleaded gas, my wife car you can do it but I try to put in 87 Octane, the MH is my first rv so I want to keep this running good for many years to come.
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Old 08-14-2022, 08:23 PM   #24
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Assuming non-turbo the higher you get in elevation the less octane the engine needs. Here in Montana the lowest octane is usually 85.5 because we are at higher elevations.
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Old 08-14-2022, 08:41 PM   #25
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I just made a trip from Western states to MidWest states, so I saw major elevation changes. I saw 85 octane as standard fuel on higher elevations. Fortunately I run a OBDLink MX+ with an IPad running OBDLink app. It allows me to create a custom dashboard. Recently I was checking out some additional parameters and found the ignition timing options. This allowed me to see how much the engine timing was being retarded. Later I will analyze thee logs to see how the octane impacted it.

Here is my current dashboard, lots of good info.
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Old 08-14-2022, 08:43 PM   #26
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We live @ 8500' and do most of our driving between 5k and 11k ft.
I use 85 octane in all our cars and the coach. Many articles I've read say a higher octane is just a waste of $$$.

Mike in Colorado
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Old 08-14-2022, 11:01 PM   #27
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I'm in the Seattle/Tacoma area and the octane here is from 85 to 89 I don't see 91 here if there is I haven't seen it.
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