Premium vs Regular on 2.0L - Buick Envision Forum
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post #1 of 14 (permalink) Old 04-19-2017, 01:59 PM Thread Starter
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Premium vs Regular on 2.0L

The inside of the gas cap door recommends Premium. The Owners Manual threatens warranty problems if you don't use premium. Buick Service gives a long political non-answer.

What do you think?
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post #2 of 14 (permalink) Old 04-19-2017, 03:50 PM
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Quote:
Originally Posted by AZ17 View Post
The inside of the gas cap door recommends Premium. The Owners Manual threatens warranty problems if you don't use premium. Buick Service gives a long political non-answer.

What do you think?
I read page 298 of the owner's Manual...only if engine knocking occurs can you not use 87 octane...then 91 is suggested. Yes, performance/economy may not be as good with 87, so it says, but don't see it mentions a warranty problem.

Never noticed knocking...been using 87 octane for 8,900 miles, in pretty close to sea level Texas.
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post #3 of 14 (permalink) Old 04-19-2017, 03:55 PM
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I'm more of a "just listen to the owners manual and gas cap" kinda guy. If it calls for 91, then use 91. The engine operates optimally with that octane level and it ensures no issues in the sense of knocking and what not.
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post #4 of 14 (permalink) Old 04-19-2017, 07:44 PM
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I heard if you have turbo engine then you're best to use higher octane?
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post #5 of 14 (permalink) Old 04-19-2017, 08:02 PM
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Dealer told me that it's a "recommendation", not a "requirement". If regular is used it won't violate warranty or cause any issues. Might just notice it being a little less performant and fuel efficient.
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post #6 of 14 (permalink) Old 04-22-2017, 10:26 PM
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Reading the owners manual, the primary recommendation is to use TopTier fuel.
Octane 87 only becomes a problem if engine knocking occurs.
Other than that it seems like a trade off between performane/economy and price.
Here in north Texas you'll pay around $2.19 for 87 octane while 93 octane is around $2.69.
I've been using 87 octane and have no complaints with performance or economy.
How much impact does premium fuel really have on economy (other than my finances)?
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2017 Premium 11
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post #7 of 14 (permalink) Old 04-26-2017, 03:04 PM
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No worries about carbon buildup??
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post #8 of 14 (permalink) Old 06-18-2017, 07:49 PM
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From the Service Manual:

"Use premium unleaded gasoline meeting ASTM specification D4814 with a posted octane rating of 91 or higher. Regular unleaded gasoline rated at 87 octane or higher can be used, but acceleration and fuel economy will be reduced, and an audible knocking noise may be heard. If this occurs, use a gasoline rated at 91 octane or higher as soon as possible. Otherwise, the engine could be damaged. If heavy knocking is heard when using gasoline with a 91 octane rating or higher, the engine needs service."

2016 Envision Prem ll
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post #9 of 14 (permalink) Old 07-13-2017, 12:23 AM
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I still don't quite understand the fact that this car uses 91 and the Equinox Terrain with the same engine but different transmission uses 93
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post #10 of 14 (permalink) Old 07-15-2017, 09:06 AM
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Octane ratings change with geographic areas of the U.S. Where the eastern US regular unleaded octane is 87 and premium 92-94, out west regular can be 85 and premium is 91 octanes.

For carbon build up concerns I'd follow GM'S Top Tier gasoline list . Regardless of octane these gasoline companies contain the additives that meet GM vehicle needs. GM has had 2.0T direct injection since 2005 and have not had the carbon build up problems of other companies like Audi. Longer highway drives help get engine operating temperatures hot for periods of time, or just a couple of full throttle runs on an onramp or merging. Full throttle won't hurt the engine as that how it was designed and will hardly be noticeable effect on fuel economy. Our 2016 Envision 2.0T is still getting 24 mpg on my 8 mile commute to work with 4 miles highway and 4 miles 25-35 mph and sometimes a quick run up the onramp or merging.

If you are using 87 octane in warmer climates and intake and intercooler temperatures rise to pre-detonation levels, some power may be lost. When we had a Buick Encore the 1.4T only required 87 octane, but one day of driving for 7-8 hours in 90° F heat there was a lack of power when accelerating up a hill after idling for a couple of minutes. The next under similar condition I had premium fuel in the tank and didn't experience any degradation in performance. We use 92-93 octane in our 2016 Envision 2.0T.
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