Offroad Trailblazers and Envoys

Fuel mileage.

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

by NC_IslandRunner » Sun Apr 01, 2012 7:08 pm

Hwy- bad

City - worse!
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by JCrayton99 » Mon Apr 02, 2012 7:57 pm

3.73 gears
stock tires
3" lift
no roof rack
early MDB fab bumper with Waag guard
TB is clean and just replaced Tstat
Cobbled test intake with spectre filter

Binghamton NY to Hartford CT---17.4 mpg


EDIT: New Fuel Mileage.
Last edited by JCrayton99 on Mon Apr 09, 2012 5:48 pm, edited 1 time in total.
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by DAKR » Mon Apr 02, 2012 11:32 pm

HAH! 18mpg this tank!
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by boog2006 » Tue Apr 03, 2012 8:12 am

2008 w/3.73 gear ratio stock

19.5 all interstate miles
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by dvanbramer88 » Sat Apr 14, 2012 11:16 pm

Non TB, but my 97 K1500 gets 14-15 combined mileage over most tanks of gas. 12 city, 16 highway. I drive a total of 32 highway miles and 10 city miles everyday to school and back, and another 15 city miles if i have work that day plus the extra daily errands. Those highway miles are usually 75-85 mph.


I can milk 18mpg out of it going to the OBX @ 65mph with the bed full of luggage, coolers etc.
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by scfd456 » Fri Apr 20, 2012 9:54 pm

2.5" lift, 31's, bone stock gears 15 city n 18 hwy
02 TB 4.2L, 4wd, 98,000 on it as of 4/19/2012, 2.5'' lift n Dakota A/T 31's
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by DirtyBacon04 » Sat Apr 21, 2012 4:34 pm

Anybody think the width of the tires has anything to do with fuel economy (other than weight)? Like more contact area creates more resistance? Thin tires get better mpg than wide?
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by Flying Monkey » Sat Apr 21, 2012 4:36 pm

I would think that would play in. More resistance
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by BigBen » Sat Apr 21, 2012 5:46 pm

3.42
33" tires
3" susp, 3" BL
EXT
12 city/ 14 max hwy.

I seem to do better on certain gases out of town. Oregon has has too much ethanol. Maybe I can start buying barrels from the marinas.
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by JCrayton99 » Sat Apr 21, 2012 9:15 pm

Yes, narrower tires do make a difference. Thats why a lot if tractor trailers are switching to super single tires. The rolling resistance of two regular tires vs one super single. The downfall for them is price. Id rather have a 255-85-16 (i think thats a 33"?) But they are hard to find.
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by BigBen » Mon Apr 23, 2012 6:55 am

The super singles aren't going to last. If you blow one you can't just drive to a shop to have it repaired. You are stuck where you are, and have to have a service truck find a tire, then bring it out to you. Plus they're harder to mount. It could take nearly a day to get one replaced.
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by Trail X » Mon Apr 23, 2012 11:24 am

If I recall, the super singles have some run flat capabilities to allow you to make it to a station. Or something... I sat in on a briefing on those a while back and Michelin had obviously thought through those issues. Lots of positive reasons to run a single and likely outweigh the negatives. It just a matter of switching an entire industry.
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by BigBen » Mon Apr 23, 2012 2:56 pm

That's fine if they're just ran flat. There are also air systems that are to maintain a constant air pressure. But neither of those do any good if there's a blowout. And that is what 90% of tire replacement is for. That's also not accounting for the upgrade cost. $600 per wheel and $800 per tire.
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by BigBen » Mon Apr 23, 2012 3:00 pm

JamesDowning wrote:If I recall, the super singles have some run flat capabilities to allow you to make it to a station. Or something... I sat in on a briefing on those a while back and Michelin had obviously thought through those issues. Lots of positive reasons to run a single and likely outweigh the negatives. It just a matter of switching an entire industry.


I have run them on trailers before. They saved about 4-500 lbs but they never wore right. I can get 600-550k out of a set of duals. My singles only made it 250k before a blowout and a service call to also replace the airbag it took out. I barely picked up .25 mpg running them.
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by Trail X » Mon Apr 23, 2012 3:14 pm

If you don't mind me asking, what kind of mpg were you getting with duallys? 0.25 is significant over long drives if you're getting 5mpg.
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by Beamer » Thu Apr 26, 2012 11:01 am

265/75/16 tires
3" of total suspension lift
3.73 gears
Denso Iridium spark plugs
Completely flat roads here in South Texas
Scan Guage says 14-16mpg avg
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by fishsticks » Thu Apr 26, 2012 11:53 am

35x12.5x17 tires
4" sus/3" body lift
4.56 gears
Front bumper with terrible aerodynamics (I'm sure)

12.5 with the roof rack on.
14ish without.
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by mikekey » Sat Apr 28, 2012 6:50 pm

Still pulling 18MPG-20MPG city depending on how annoyingly slow we want to drive. If I give up the hyper-miling and just drive normally it has dropped down to 16MPG. Which isn't really horrible. However my setup is pretty much stock compared to everyone else here.
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by zeon_911 » Mon Apr 30, 2012 12:41 am

I'm lucky to get 16 -17
Stock suspension 145k 265/75/16
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by navigator » Thu May 31, 2012 12:40 pm

Very odd, I checked my gas mileage on a trip yesterday and I got 222.3/12.12 = 18.34 mpg at mostly 70mph with cruise.
The past few times I had gotten just under 16mpg.
It must have been the rain reduced tire friction or something because I don't think anything else has changed.
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