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I have an 03 trailblazer LT swb 3.73s with 188k on the clock with the 4.2 vortec, at highway speeds of 75 mph and sometimes 80mph I can achieve 19-21mpg (hand calculated), was wondering what you guys were getting out of your TBs, mine is pretty much fully loaded.
The mileage was made on a trip from Shreveport, Louisiana to Rockport TX, about a 7hour drive with Houston traffic included, overall it’s a 430 mile trip. I have made trips to Mount Ida Arkansas which had lots of hills and was still able to achieve 19-20mpg, is my truck some sort of freak?
 

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2004 Trailblazer LS 4x4, 4.2L:, 2016 ATS-V, 2014 CTS-V Wagon, 2018 Audi A7
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My 4,2 4x4 has averaged 17 mpg over a few thousand miles. 89,000 on the odo
 

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My 2006 has 120k miles, gets about 13.5 mpg. But I also have 32 inch mud tires, 3.42 gears and 3 inches of suspension lift on mine.

I plan to swap 4.10 gears in some day, and I think that will help. Everyone thinks lower gears help MPGs but on something this heavy and the larger tires, you actually get better MPG (especially in city) with higher gears. Taking off doesn’t take as much stubble for the engine lol
 

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Discussion Starter #5
My 2006 has 120k miles, gets about 13.5 mpg. But I also have 32 inch mud tires, 3.42 gears and 3 inches of suspension lift on mine.

I plan to swap 4.10 gears in some day, and I think that will help. Everyone thinks lower gears help MPGs but on something this heavy and the larger tires, you actually get better MPG (especially in city) with higher gears. Taking off doesn’t take as much stubble for the engine lol
Yea I’d like to go up to some 30s or 31s and maybe go to 4.10s to get a little more pickup over stock. I expect my mpg to drop down to 17-18hwy
 

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2004 chevy trailblazer_lt
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I got an average of 19.14 MPG in over 18000 miles of interstate driving over a 10 month period of time range was from 16.39 to 21.87 MPG). About 60% of the time normal highway speeds on I-95 between Baltimore and the DC beltway, and the other 40% of the time was a combination of stop and go driving and 30 - 40 MPH driving. This is for a 2004 4WD 4.2L TrailBlazer. Driving in town I get about 14.3 MPG.
 
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