Why dont we get 28mpg??? - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2006 - 2009 TrailBlazer SS Tech > 06-09 SS Engine and Drivetrain > Air Induction

Air Induction Performance Air Intake/Air Induction Modifications

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  #1  
Old 03-15-2006, 09:54 AM
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Why dont we get 28mpg???

quick question. i think the vetts get like 28mpg pretty much same motor as we have in our truck. i know our trucks weigh more and have 4.10 gears but i dont think that equals to 10-15 mpg less than the vett. Im just wondering why these get that much less mileage. Anyone??
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Old 03-15-2006, 10:00 AM
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a corvette weigs about half of what a trail blazer weigs
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Old 03-15-2006, 10:17 AM
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Big gearing difference, big weight difference, huge aerodynamic difference. Easy to figure out if you ask me.
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Old 03-15-2006, 10:31 AM
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I drove from Jacksonville to Pensacola and back this weekend. One way it is roughly 5 hours.
With the cruise control set on 85, 2 kids, wife and luggage, was getting an average 13.9 to 14.4 on the highway.
We met up with my parents 1/2 way and I drafted him for the rest of the trip (05 yukon denali xl). I reset my average economy thingy and was getting 15.9 to 16.2 going 85.
4:10 not too good on gas but great for passing
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Old 03-15-2006, 10:33 AM
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Quote:
Originally Posted by blautens
Big gearing difference, big weight difference, huge aerodynamic difference. Easy to figure out if you ask me.
Ding, ding, ding! It's that simple.
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Old 03-15-2006, 11:00 AM
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Quote:
Originally Posted by TBSSTony
Ding, ding, ding! It's that simple.
Agreed, in order I would have to say (1) gearing, (2) aerodynamics, and to a lesser extent, (3) weight. Once you're going a certain speed, weight doesn't have that much to do with it. I would also add that (4) continually feeding a big 6.0L motor (without DOD) certainly doesn't help.

Gearing, and its main resultant (high RPM at speed) is the big one. Cruising at 2500-2700 RPM just kills mileage. LSx motor efficiency range is ideal at 1800 +/- 100 RPM or so; once you get above 2000 RPM you lose MPG quickly. That's why we really needed the 6L80E.
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Old 03-15-2006, 11:16 AM
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Gearing, and its main resultant (high RPM at speed) is the big one. Cruising at 2500-2700 RPM just kills mileage. LSx motor efficiency range is ideal at 1800 +/- 100 RPM or so; once you get above 2000 RPM you lose MPG quickly. That's why we really needed the 6L80E.

Yea 2800rpm @ 85 mph
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Old 03-15-2006, 12:12 PM
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That's why we really needed the 6L80E.
Yes, yes we do. Better holeshot and wayyy better mpg too. I'd [u]really[/u] like to see someone proficient at doing the 6L80/90E conversions by the time my 3/36 warranty is up.
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Old 03-15-2006, 12:37 PM
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Yes, yes we do. Better holeshot and wayyy better mpg too. I'd [u]really[/u] like to see someone proficient at doing the 6L80/90E conversions by the time my 3/36 warranty is up.
That's right - with a 4.02 first gear you can run 3.23's in the back and have the same off-the-line torque as with our 4L70E/4.10 combo. Mate those 3.23 rears with the 6L80E's .67 final overdrive and you've got 2000 RPM @ 80 mph instead of the 2650 RPM we are running at now. Translation? Another 4 mpg, or more, probably.

That's the main reason I got 2WD....I fully expect someone to have figured out the retrofit within the next 12-24 months, and there's no way you will get a 6L80E to mate up with any transfer case (well, for any reasonable amount of money anyway).
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Old 03-15-2006, 02:14 PM
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you also have to keep in mind the vettes have 6 speed trannys, so they aren't really going up high in the rpm band anyway. i think they should make an 8 speed for us, like in the new ls450
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