That's not very good. I get around 18-19 mpg combined on mine which is basically identical to your truck. Mine has the 4.10 rearend, guessing yours possibly does as well. I get about 15 mpg when I'm towing my small Aluma utility trailer with my Suzuki King Quad 750 on it. Its very light towing(about 1200 lbs total) but it does make a difference in mpg. Might want to check your air filter and most likely replace it. Might need a tuneup as well if it has really high mileage. Tires can make a difference too, even if they are still stock size. More aggressive tires will get you less mpg.

 

That's about what I get on the highway. 3.7L lifted on 33s with 3:73 gears 4x4

 

My 06 crew cab got 18-19 on interstate this weekend. 4wd with 31/1050/15 all terrains. I can’t tell ya tank because my gauge is off. So when it show 1/4 tank only take 10-11 gallons at most


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Tanks are about 19 gal

 

19.6 gal I believe, so basically just under 20 gallons. 275 miles per tank would net you 14 mpg. My 99 Silverado 5.3 Z71would get 13 mpg with 3.73 gears and 285/70/17 at tires. These trucks should all get at least 20 mpg unloaded, it almost seems a crime that they don't. Newer Colorados don't do any better but they do have a lot more power with the 3.6 V6 making 308 hp. I guess you have to have a 2wd 4cyl and manual to really get good mpg in a Colorado. I have heard up to 30 mpg with that configuration. And yes it does seem the gauge is not very accurate. I have thought I was getting really low according to the gauge but it didn't take nearly as much to fill it up as the gauge would have indicated.

 

I averaged 25 mpg on a recent 800 mile highway trip in my '06 regular cab I5 with auto trans. And that's with A/C and hauling about 400lbs of stuff. Truck has 140,000 miles, with a new air filter and upper Oxygen sensor.

I also was using this intake, but I'm not sure how much it helps mileage. I'm going to make a similar run in a few weeks with the stock intake, and I'll report how it compares.

Update: Recent 800-mile trip with the same load and the stock intake: 25-26mpg.

 

First, what size engine? Automatic or manual trans? How many miles? Any mods? Mine is a I5, 4X4, Crew Cab, auto. I average 22 mpg. 144,750 miles. I don’t know if that’s good, bad or average. It is what it is.

 

Mines same as yours. With 89k miles. Never seen above 20mpg


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'04 3.5 5mt ext-cab 2wd 162+K w/200# of tools 27mpg or with 600# of stuff & lots of traffic 24.5mpg. Both averages include a little WOT in 3rd gear to pass creepers so these are not econo runs. These were my last two tanks of California's version of 89 octane which is 10% ethanol so with some straight 100% gas I think 30 would be possible with the truck empty.
For good MPG you need a fresh upstream 02 sensor, good MAP sensor, and lots of air in the tires. Smooth driving, moderate acceleration, minimal braking, & keeping it under 70 helps a lot. Our aerodynamics suck and tickling two tons doesn't help either.

 

With mine. I changed plugs and installed sparkz at the same time. Pulled out the intake baffel and put in full synthetic oil. I get about 27 on interstate and about 22 in town.

 

Damm, I avg about 15-17 all around, I thought i
was doing bad, but i guess i'm not. tuner has it
set to run a little richer to protect the eng from knock.

 

I am a 4x2 Z71, lifted on 32's with 3:42 gears and I get around 17 mpg average everyday driving, which equates to 333 miles per tank. Not sure what the 4x4 costs you in fuel mileage, but it seams a little low to me. Just my 2 cents.

 

04 crewcab 4x4 z71 with 4.10 gears on 31x10.5x15's here. I'm averaging about 22.4 right now, with highway (non-interstate) driving. I don't do much freeway driving these days.

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I have the 04 Crewcab I5, at 273000 miles still getting over 400 miles (around 21.3 mpg) to the tank

 

'10 ZQ8 with 5.3 and have gotten 16-17 mpg regularly around town. Got over 20 mpg a few times on the highway but not frequently. 85,000 mi. But then mpg was not the reason I bought truck.

 

07 Z71, I5, same mileage... 110K mi

 

My 2005 Canyon crew cab 4WD with 3.73 gears and factory size tires (P265/75R15) gets 17 - 19 around town and 21 - 22 on the highway. One thing to be aware of is that if you put larger tires then factory on the truck the speedometer / odometer will read less than actual mph / mileage and throw your mileage calculation off. This is especially true at 70+ MPH where the tires can even "grow" in diameter. I like to use Waze to check actual vs what the speedo reads.

 

I get around 15 MPG with no city driving on my 05 I5. Been trying to get my numbers up, but I don’t want to throw parts left and right until I find the cause. But I will keep working to figure it out because 20+ mpg sounds real good on the wallet. Anyone else had this problem, and is there one most likely cause on these trucks?

 

Just for data points, I have a Z71 4x4, Hankook Dynapro "off-road" 31x10.5x15 tires. I have replaced the front O2 sensor with a Denso sensor, new plugs, cleaned the MAF, and replaced the leaky breather (vacuum?) line behind the intake.

I didn't really pay attention to the gas mileage the first couple of months I owned this truck. None of the parts were replaced specifically to improve gas mileage. They were just done when I first got the truck as a mini tune-up. I also don't know which gears I have. I'll have to check the RPO sticker.

https://www.amazon.com/Hankook-DynaPro-RF10-Off-Road-Tire/dp/B004QL6936

 

I have a 2005 i5 4WD Extended cab.
I usually get around 18-20mpg around town mixed driving, when it was brand new I seem to recall it got around 20-21 around town.

If I get it on the freeway for a longer period (like a 4 or 5 hr trip) and keep it on cruise at about 70mph/2000rpm, in the past I have gotten 24-26mpg with it. I have not been on one of those trips recently so I don't know if that's changed significantly or not.

 

Well I went on my first long distance road trip yesterday. Went to Dallas from Houston and back. I have been getting 22 mpg in town. So we filled up in Huntsville. Drove to Ennis, Texas, at 80 mph. Got 18+ mpg with a slight tail wind. Then returning back to Houston, filled up again in Ennis, Texas. Then I drove at 70 on the dash. Speed signs said I was accually doing 68 mpg, with a slight head wind. Mpg was 28 + mph. I think I may have exceeded my i5 engine performance torque curve at 80 mph. So in spite of 75 mph on our Texas highways, i’ll keep her under 70 for fuel mileage. Anywho, I now am beginning to have some degree of confidence in the little truck. Made it back with no issues, I did find out that if you turn on your directional signal, and drive a certain distance, you get a chime, and a warning “directional signal”. I found that interesting. Still looking for a “deal on a 6.0 L engine to replace the I5 engine. My wife and I both agree that the seats in the 2006 Canyon are much more comfortable then the seats in our 2012 CRV on long trips.

 

Unless he's running his truck completely out of gas before he fills up, we have no idea what his mileage is! We don't know unless he tells us how much gas it takes to fill the tank when he gets to 275 mile on the trip meter. You're all assuming he's used 18 gallons (or 18.5, or 19 or whatever the tank holds). In order to determine MPG's, he needs to fill up and see exactly how many gallons it took to drive the 275 miles. His gauge may be showing he's getting low when he has 5 gallons left in the tank.

 

I'm not OCD but the last few years I have been interested about the MPG of our family vehicles. MPG is really simple if you get into a really simple habit. Whenever you buy gas fill the tank, write the mileage of the trip meter on the gas receipt, & reset the trip meter to zero. Because my speedo/odometer's are all pretty accurate (truck is dead on) once at home I simply divide the miles driven by the gas used and have the exact mpg for the last tank.
If you are stuck with E-10 gas like I am, it probably causes about a 5% reduction in MPG over straight gas. I'm confident that 28-29 or maybe 30 MPG would be possible
if I could get E-zero 89 octane gas. Ethanol sucks especially on boats with pre-mix 2-cycle outboards.

 

I do that every time I fill up. This way I know when it needs maintenance
With mine I get 21-22 in town and 24 on interstate. My interstate mpg should be better.

 

That's about what my '09 2.9 WT does as well. I do know I lost about 1 mpg when I replaced the General tires that came on the truck (but gained so much better wet handling).

I think on the Interstate my best was 25 mpg , but I din't do much interstate travel. Mine is all city\ rural highway and usually not over 62.

 

WOW, new personal best! 436.8 miles on 14.003 gallons of Arco 89 octane E10 gas = 31.19 MPG. On this trip I also had about 350 lbs of tools onboard. I'm a happy man. What is it you ask.
'04 3.5 5MT 2WD extended with 165K and recent valve job. Also enlarged filter box inlet, Supermod ported throttle body & 89 octane tune, group 65 battery, port-matched exhaust, and pre-cat delete. Everything else is OEM.
In a different post we are currently discussing the value of changing downstream 02 sensors. I'm not convinced that the downstream 02 sensor has anything to do with MPG but this truck still has the original '04 sensor. Would a new one help, I don't know but some say it would. The jury is still out.

 

I put new o2 in mine and just like every other vehicle I’ve tried new sensors. I got a zero change.


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