Does everyone use premium gas with the turbo? - Page 3 - TerrainForum.net: GMC Terrain Forum
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post #21 of 26 (permalink) Old 01-25-2019, 12:05 AM
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FWIW, we live at 7,500 ft elevation... even with a turbo I kinda doubt that octane makes much difference but I'm not sure about it. This is my first turbo so I've been using mid grade fuel and it seems to do fine. Premium costs about 90 cents/gal more than regular around here.

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post #22 of 26 (permalink) Old 01-25-2019, 10:02 AM
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Originally Posted by taoshum View Post
FWIW, we live at 7,500 ft elevation... even with a turbo I kinda doubt that octane makes much difference but I'm not sure about it. This is my first turbo so I've been using mid grade fuel and it seems to do fine. Premium costs about 90 cents/gal more than regular around here.
Inside your engine, with the turbo spooled up, it's virtually the same as being at sea level. The turbo boosts to a given pressure, regardless of outside atmospheric pressure--that's why turbos and superchargers were put on aircraft when they used recip engines: to maintain power and increase the ceiling altitude. Therefore, high octane is essential regardless of your elevation, in accordance with manufacturer's suggestions, to prevent damage to the engine at high boost/high compression.
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post #23 of 26 (permalink) Old 02-19-2019, 10:14 PM
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I've been running a mix of 91 and 89 since I purchased the truck ('09 Terrain Denali). I will check my millage numbers and report back. I have not attempted to run regular as of yet to see the difference.
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post #24 of 26 (permalink) Old 03-25-2019, 09:38 PM
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Stick with the recommended fuel for a turbo charged motor. It has nothing to do with each individuals mileage and everything to do with the life of the turbo and valves as well. Running a lower octane works with the advanced computer control but it also is sending false signals and may be retarding or advancing your timing incorrectly. In turn this can lead to an overheated turbo.

I have seen one on an Audi red hot and then catching fire. It was not pretty.

I am so glad to have the V6. But please people run the correct fuel in your beautiful GM automobile.
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post #25 of 26 (permalink) Old 03-25-2019, 11:25 PM
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Originally Posted by garbec01 View Post
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This is regarding the 2.0 turbo; the recommended fuel for the 1.5 turbo is regular grade 87 octane.

So far all that I use is Top Tier Phillips 91 octane, no ethanol or BP 93 octane, with ethanol.

I'm just a little gun shy of using 87 octane because of a potential LSPI issue with these direct injected turbo engines: Just not willing to gamble with an engine failure if better fuel can potentially avoid it.

Remember, LSPI is an issue among various manufacturers using small displacement, direct injected, boosted induction engines, and the cause hasn't been completely understood or resolved yet.

I also use a Dexos1, Gen2, certified oil: Mobil1 Extended Performance 5W-30 in my 2019, 2.0 Equinox, to also aid in preventing the LSPI phenomenon.

If the GM powertrain engineers recommend premium fuel, I'm going with that recommendation.

.
I only use what is recommended by the manufacturer which is super at 92-94 octane. I average around 40-44 mpg Canadian or 33-37 mpg (us). There are a lot of differences other then mpg for using a top tier premium gasoline, and I spent 50K for a fully loaded Denali, so why would I try and save a couple of dollars with a cheaper gasoline. Just my thoughts.
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post #26 of 26 (permalink) Old 03-26-2019, 04:56 PM
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Well Said. I'm a retired ASE Master Tech. It goes as tharvey57 sort of says. If you have to ask how to save pennies, you bought the wrong vehicle. This reminds me of the guys who buy supercharged jet skis and won't buy the proper fuel. They get towed in off the lake or ocean, motor blown. The computer in the car can only make up for issues for so long, then the possibility of "Kaput" increases. Put your big boy panties on and suck it up!
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