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2021Trailblazer RS AWD Scarlet Red Metallic
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Both Trailblazer engines will run fine on 87 as they were designed too, but there are benefits to running 91 like smoother running and more overall power. The Trailblazer has a static compression ratio of 10.0:1 and under full boost (22psi) that can increase to as high as 18.0:1. When using 91 the timing maps stay on the high end which delivers the most power while running on 87 pulls timing to prevent detonation which also reduces power. I always got slightly better gas mileage on 91, but since it's also more expensive it won't offset the cost. I suggest experimenting with both octanes to see if you notice any difference.
 
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Both Trailblazer engines will run fine on 87 as they were designed too, but there are benefits to running 91 like smoother running and more overall power. The Trailblazer has a static compression ratio of 10.0:1 and under full boost (22psi) that can increase to as high as 18.0:1. When using 91 the timing maps stay on the high end which delivers the most power while running on 87 pulls timing to prevent detonation which also reduces power. I always got slightly better gas mileage on 91, but since it's also more expensive it won't offset the cost. I suggest experimenting with both octanes to see if you notice any difference.

We use Regular gas. Just have 5,000+ miles today. At first we were seeing 26-27 MPG ( kinda disapointing ) but on our last two long distant trips we got 30 and 31 MPG.
We do not use the onboard system to tell us gas mileage. We keep a log and do the math. All that matters is how much did you buy and how far did you go. I dont trust the onboard computers. They lie...
 

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We use Regular gas. Just have 5,000+ miles today. At first we were seeing 26-27 MPG ( kinda disapointing ) but on our last two long distant trips we got 30 and 31 MPG.
We do not use the onboard system to tell us gas mileage. We keep a log and do the math. All that matters is how much did you buy and how far did you go. I dont trust the onboard computers. They lie...
My city mileage is terrible, getting around 26ish. but i dont really drive that often at the moment so its not a big deal. But highway it will get around 31ish.
 

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2021 TB Zues Bronze Activ
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HWY trips going 65/70 MPH not driving it like a race car we get 34/35 mpg.
I don't really pay attn to city but I think it is about 28mpg?
 

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2021 LT AWD
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If we're discussing fuel economy, my overall average is a somewhat disappointing 26.9. I use fuelly.com to track my mileage in all of my vehicles so I don't have to do the math myself. According to the site, "Based on data from 9 vehicles, 417 fuel-ups and 103,574 miles of driving, the 2021 Chevrolet Trailblazer gets a combined Avg MPG of 26.67 with a 0.52 MPG margin of error." So, I guess I should be happy with my numbers. Notably, I have an AWD model with the 1.3 L engine; I do a pretty even mix of highway and around-town driving; I almost always use the "sport" mode because I prefer how the steering responds; and I have a bit of a lead foot. I suspect someone else could get much better numbers than me with the same vehicle.
 

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2021 TB Zues Bronze Activ
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Sport mode and LEAD FOOT is why you are not getting more MPG. I never use Sport mode and drive 65-70 MPG and get 35 avg on the HWY. 28 or so city.
 

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2021 Trailblazer Activ Zeus Bronze Metallic (+2022 Silverado 1500 RST Z71)
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Turbos can provide wonderful fuel milage with an economical driving style, but suck gas quickly if you are heavy on the pedal.
 

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If we're discussing fuel economy, my overall average is a somewhat disappointing 26.9. I use fuelly.com to track my mileage in all of my vehicles so I don't have to do the math myself. According to the site, "Based on data from 9 vehicles, 417 fuel-ups and 103,574 miles of driving, the 2021 Chevrolet Trailblazer gets a combined Avg MPG of 26.67 with a 0.52 MPG margin of error." So, I guess I should be happy with my numbers. Notably, I have an AWD model with the 1.3 L engine; I do a pretty even mix of highway and around-town driving; I almost always use the "sport" mode because I prefer how the steering responds; and I have a bit of a lead foot. I suspect someone else could get much better numbers than me with the same vehicle.
I am 1 of those 9 that is bringing down the average, lol
 
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