Offroad Trailblazers and Envoys

Fuel mileage.

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

by Shdwdrgn » Fri Aug 22, 2014 10:55 pm

I bet your mileage really sucks in the Winter then... Half your trip is spent warming up the engine, and as it gets up to temp, you shut it off. That alone will simply kill your mileage, and as I mentioned, in the Winter it will be even worse. Unfortunately there's not much you can do about that, it is just the way things work. Most people don't notice how much gas is wasted during warm-up because it averages out over a longer trip.
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by nickpls » Sat Aug 23, 2014 3:34 am

I let it warm up in the winter for sure, a little bit this time of year too.

Do any mods help with MPG? Intake? Exhaust? I'm going to clean my TB before next fill and see if that helps.
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by KE7WOX » Sat Aug 23, 2014 5:16 pm

nickpls wrote:I let it warm up in the winter for sure, a little bit this time of year too.

Do any mods help with MPG? Intake? Exhaust? I'm going to clean my TB before next fill and see if that helps.


P-metric highway tires. A 245/70/17 Michelin LTX M/S2 (closest to what I had, 245/65/17 LTX M/S) is 35 lbs per tire. An LT265/70R17 E Wrangler Silent Armor (current tire) is 52lbs and 2 inches larger in diameter.

Honestly, I doubt that cleaning it will help much unless you are a hoarder, or you go to extremes and strip the interior down to the body sheet metal (or take out the rear seats).

12MPG is too low.

You can use a Scangauge to measure fuel consumption and then check the miles driven, but trips that short are very sensitive to spikes in instantaneous MPG.

I'd measure with the trip odometer between fill-ups, keep track of them in a spreadsheet and see what happens.

I plotted the trip between Arizona and Ohio when I moved. The lowest MPG were between Amarillo, TX and Joplin, MO.
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by Shdwdrgn » Sun Aug 24, 2014 12:49 am

nickpls wrote:I'm going to clean my TB before next fill and see if that helps.

KE7WOX wrote:Honestly, I doubt that cleaning it will help much unless you are a hoarder, or you go to extremes and strip the interior down to the body sheet metal (or take out the rear seats).

I think he was referring to the Throttle Body... :poke:
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by nickpls » Sun Aug 24, 2014 2:20 am

lol yes sir, I was referring to the throttle body..was too lazy to type it out haha
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by BC backroader » Mon Sep 15, 2014 2:11 am

My recently purchased '05 EXT LT , 127,000kms (79k miles) is running completely stock right now, with 245/65/17 Hankook ATs at 35 psi, and 3.42 gears. I checked mileage, from full tank to full tank, on a 425 km (265 mi.) run the other day, with 40% freeway at 75 MPH, 40% mountain 2 lane at 60-65 MPH, and 20% logging roads, some in low range, at low speeds, less than 20 MPH. The trip average was 16.2 MPG(US) or 20.2 MPG Imperial. I think that's pretty good for a truck of this size and weight, especially since I don't hypermile, but drive for fun and performance, so I'm a bit heavy on the throttle, but smooth. My buddies were impressed with both the highway and logging road performance, and comfortable all day, which is saying a lot, as the combined age of the 3 of us is 229 years!
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by BC backroader » Tue Sep 23, 2014 12:46 am

Checked another tankful last week, and got nearly identical results, 20.67mpg (Imperial), this time about 80% freeway runs, 20% around town on short errands.
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by Trail X » Tue Sep 23, 2014 11:10 am

Surprisingly low for a stock vehicle. I get about 15.5 MPG (US) pretty regularly with 70% highway usage, and can get into the 16.5-17 mpg range if I keep my speed low on the interstate. Well, at least before the new roof rack, it probably stole another .5 from me.
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by BC backroader » Tue Sep 23, 2014 11:44 pm

Converted to US gal, my latest tank was 16.54 mpg, which seems to be what most other posters in the thread are reporting. Some with larger tires are getting an extra couple of miles, obviously the higher effective gearing helps them out.
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by Cable810 » Fri Sep 26, 2014 3:40 pm

Filled up and got 15mpg not bad as I usually average 17mpg but thats when I'm driving 2+ hours. My Scanguage has been spot on for me.
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by Cable810 » Fri Nov 28, 2014 10:01 am

Went over to Travers City last week to pick some parts up. Got 14.4 MPG on the way over and on the way back with about 500lbs I got 16.7mpg. Thats just what the Scanguage showed me.
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by tarsh » Sun Nov 30, 2014 12:28 pm

i still hate you for your mileage. according to the tb Gage i get like 11, on 32's but i do have the rack tire swing and the bumpers. but still, its bad.
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by captnewt » Sat Dec 06, 2014 7:08 pm

33's stock gears, 12 mph city
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by HARDTRAILZ » Sat Dec 06, 2014 7:21 pm

captnewt wrote:33's stock gears, 12 mph city

Not much of a speed demon are you?
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by DirtyBacon04 » Sun Dec 07, 2014 9:21 am

hahaha!

On my way to and from TECORE XI, i was averaging 16-17mpg while fully loaded. I was pleasantly surprised.
thats with 4.10, 33's
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by captnewt » Sun Dec 07, 2014 8:46 pm

Hahaha. How much do you think a 4.56 upgrade will run me? (Parts and labor 4x4)
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by Moots1288 » Sun Dec 07, 2014 9:43 pm

$1500
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by DirtyBacon04 » Mon Dec 08, 2014 5:23 am

I'm willing to bet if you have a shop do ALL of the work, you'll be looking at least $1500 in labor alone. A shop quoted me at over $2k for regearing my front diff only. (most being labor)
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by v7guy » Mon Dec 08, 2014 5:37 am

It massively depends on how much you're planning to do yourself.
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by Moots1288 » Mon Dec 08, 2014 9:14 am

DirtyBacon04 wrote:I'm willing to bet if you have a shop do ALL of the work, you'll be looking at least $1500 in labor alone. A shop quoted me at over $2k for regearing my front diff only. (most being labor)
damn that's alot, I had a quote of $750-$900 and thought that was alot for the front.
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