Offroad Trailblazers and Envoys

Fuel mileage.

Trailblazer and Envoy related, but not off-road related...

by Cable810 » Mon Dec 08, 2014 11:07 pm

I got a quote of 300-500 with me providing the gears and rebuild kit
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by HARDTRAILZ » Tue Dec 09, 2014 9:30 am

Rear diffs are 225 round here and front I never priced but I would imagine the extra work work be a good bit more for removal and reinstall
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by Trailblazin Ahead » Fri Jan 16, 2015 4:17 pm

255/75r16, 3.42 gears. Have exhaust and CAI gets 15-17 in stop and go, 70 on freeway 18-21 depending on my foot
SMELLS LIKE HARD WORK AND DEDICATION
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by Anthony Hernandez » Sat Jan 17, 2015 3:25 am

07' 3.73 gears, limited slip, 255 75r17 bfg mt's, maybe 11 highway if I'm really feathering the //// pedal :/
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by Grimor » Sat Jan 17, 2015 1:29 pm

before i swapped the bigger tires and rear, i got 22 mpg highway...

now I'm getting 13.4 city/highway and 11 in 4high on snowy roads. (doing donuts in the yard all weekend may of influenced the 11mpg)

the 4.10 gearing kinda hurts at 70mph
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by HARDTRAILZ » Sun Jan 18, 2015 2:50 pm

4.10s give better mpg than 3.73 at 70
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by Moots1288 » Sun Jan 18, 2015 3:00 pm

I dont go 70 MPH often in NYC but I can 100% see a difference between 3.73s and 4.56s on 33's I got about about give or take 3 mpg since.
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by Jrgunn5150 » Wed Mar 04, 2015 3:57 pm

I've been getting a steady 14.5 no matter what since I bought it two months ago. 5.3, 3.42, 245/7/17
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by Whitelightening » Tue Jul 21, 2015 4:52 pm

I get a steady 15.2...I guess it's not that bad
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by Jrgunn5150 » Tue Jul 21, 2015 5:02 pm

I changed my hubs and its climbed to 15.6 over the past few days.

I have new plugs and wires en route, it may go even higher lol
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by mason10198 » Thu Dec 31, 2015 7:13 pm

33" tires, 3.42 gears. Dont know weight. 13 MPG city. I haven't gone more than 20 miles interstate at a time since I bought it. I think I was getting around 15-16 when I had the stock wheels/tires but I didn't have the scangauge to tell me instantly yet.
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by NC_IslandRunner » Thu Dec 31, 2015 7:54 pm

33s with 3.42 gears, you are high risk of breaking something offroad.
IF THE FISH STOP BITING... HUNT FOR SHELLS!!!
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by mason10198 » Thu Dec 31, 2015 8:16 pm

NC_IslandRunner wrote:33s with 3.42 gears, you are high risk of breaking something offroad.

Are you just talking about powertrain? I always use low range unless I'm on flat ground to keep it from stressing too much.

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by Shdwdrgn » Thu Dec 31, 2015 8:45 pm

That doesn't protect anything after the transmission though. You're still running a low gear ratio to a large tire, and requiring the drive shaft and rear axle to take the brunt of the torque.
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by Rickalicka18 » Thu Dec 31, 2015 9:11 pm

255/75/17 is a 32.06 tire not 33"
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by mason10198 » Thu Dec 31, 2015 9:28 pm

Rickalicka18 wrote:255/75/17 is a 32.06 tire not 33"

depends on brand. tire guy told me that my specific tire comes out to about 32.7 at 40psi. although he could very well have been wrong.

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by Rickalicka18 » Thu Dec 31, 2015 9:39 pm

Only way to know would to measure it i guess haha
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by Rickalicka18 » Mon May 16, 2016 9:41 am

18.7mpg with 265/70/17 tires and 3.42 gearing. Don't know how I did it... I was really just driving normal around the city/backroads.
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by Cable810 » Mon May 16, 2016 12:48 pm

I've been avg between 10 and 13mpg. the avg seems to be around 11
The FIRST Solid Axle Swapped Trailblazer in Presque Isle County MI
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by HARDTRAILZ » Wed May 18, 2016 12:34 pm

I kept a good eye on the MPG for this past weekends adventures. I filled up and drove 180 miles with half at 60ish and the rest 75ish mph. Scan said 16.1 mpg on arrival. I put ten gallons of fuel in for the trails. Leaving Sunday I was at 260 miles and needed an additional 9.9 gallons to fillup. That put the mixed driving right at 13 which I though pretty good for some well used low range over the trails. I drove the 180 miles home at 65 due to Matt not having OD and him following me. I showed 17.2 for that trip. I have repeatedly seen my scangauge to be an accurate reflection of hand calculations so i trust it with .5 mpg either way. Pretty happy overall with the setup currently.
I hate to advocate weird chemicals, alcohol, violence or insanity to anyone...but
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