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2021 Chevy Trailblazer RS AWD
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The first time I filled the enormous (13.2 gallon) tank, I packed in 10.49 gallons. Over 300 miles driven (and some idling) that equates to 28.8 mpg. I do not drive like I'm on an economy run, so that mileage is fine. I have no clue of the stealership packed the tank full, the same as I, so it could be a little better.
 

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2021 Chevy Trailblazer RS AWD
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Discussion Starter #2
2nd tank 31.9 MPG, mostly highway. 13.2 gallon tank. Put in 11.9. Low fuel alert NOT on, last light square lit.
 

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Question about gas for this car: the manual says recommended minimum of 87 octane. I know it has a turbo in it and in my experience with turbos they usually require higher octane. So, is 87 sufficient like the manual says, or should I use mid-grade or higher?
 

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2021Trailblazer RS AWD Scarlet Red Metallic
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Question about gas for this car: the manual says recommended minimum of 87 octane. I know it has a turbo in it and in my experience with turbos they usually require higher octane. So, is 87 sufficient like the manual says, or should I use mid-grade or higher?
Good question. I've been running 91 octane since my first fill up and my average mpg has been 29 which is close to the rated combined mpg. The little 3cyl seems to like the 91 better, probably because it stays on the high octane map which will alllow more spark advance and timing which equals more power. From my experience with other small turbo engines especially the 2012 Cruze I had a few years back they really do benefit from higher octane. Do you need to run 91, absolutely not. The engine is certified to run on 87 and will run just fine plus you may not gain any mpg with 91 so it will cost more money at each fill up. I guess the answer is if you want a little more power and smoother running engine go with 91, but if you care more about saving money go with 87.

Steve
 
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