Gas Mileage

Been lookin' arund for an H2. What can I honestly expect for gas mileage.

Thanx

Zim

10MPG but I am still in the break in period. Not sure I believe it but some folks suggest once you get a couple thousand miles on it you might improve up to 12MPG.

Heck, it's a hummer!

If you can't afford the gas, you can't afford the truck. ;)

Someone posted that a supercharger can greatly improve your mileage. :D More power and better gas mileage. Sounds good to me.

well, at least we can see where "snide" gets his name from.:rolleyes:

It gets 10 mpg....and thats freeway! Gas milage on the H2 is not great. In fact it is the worst gas efficiency truck I have ever been in let alone owned. But besides that, it is worth it. It has massive power and was , in my opinion, the best towing truck I have ever had. It had more than enough power and handled as if my boat was not even behind it. Anyway hope all is well. Take care.

Isaac
03 H2 Hummer
Lux Series
Black

Just finished my third tank, and I'm getting 11.5 mpg. Should increase to 12 over even better as the engine breaks in.

You just need to supercharge it to pick up a few more mpg. :)

Do you folks have the YD3 Base Axle or GT5 4.10 axle?

Didn't even know there where different axles, thought they all where 4:10's on H2s

Originally posted by 03YellowH2
Didn't even know there where different axles, thought they all where 4:10's on H2s

Glad you said that. :) I am confused also.

Those are the 2 RPO's listed for the H2 that relate to axles, and knowing GM and their sometimes redundant RPO codes they're probably the same. I reviewed about 40 window stickers on GMBUYPOWER.COM they all have the 4.10 listed.
So if someone can shed some more light on the YD3 Base Axle GT5 4.10 axle RPO codes, please do. The 4.10 is definately one of the culprits in the quest for "good" fuel mileage. Most "fullsize" SUV's have around the 3.70 range as a "towing" axle.
Cheers!

Just out of curiosity, why does the H2 see worse mileage than other large GM SUVs? Is it extra weight, or?

What is the range you guys have seen then between fill-ups?

simple answer to the gas mileage question is the H2 is fulltime 4X4. That kills the gas mileage. The Yukons and Avalanches which share the same footprint have a 2WD range which is the reason for the higher mileage.

As for Range I have not seen higher than 330 yet. I've seen stories of 365+. We can all hope...

I just returned from a little over a 3000 mile trip that included interstate and highway travel towing a 6x10 trailer weighing less than 2000 pounds and some local touring in the southwest without the trailer. I reviewed my records and made several observations that may be of interest if you are concidering purchase and questioning gas efficiency. The fuel economy definitely increased after 2000 miles appeared on the odometer since new. The frontal shape, high profile, and large tires make the fuel economy very susceptible to wind, either from speed or environment. Vehicle speed above 55 or 60 has a very evident adverse effect on economy and if nature's wind is striking anywhere from 90 degrees to the side to full on the effect is amplified. During the trip I experienced wind from 10 mph up to and in excess of 40 mph (bad day) and a worst case mileage of 8 mpg at 60 mph while towing. My best tankful in no wind condition and long flat stretches with no starts or stops @ 65 mph netted 12.5 while towing. Stop and go driving kills better mileage, but in the southwest with smooth driving tactics and avoiding stops and starts by predicting traffic lights in advance and laying back and coasting to avoid the stops netted over 11 easily. Backroad traveling in the mostly flat and straight areas while not towing the trailer and holding the speed to 60 mph provided the best short term mileage at 15mpg, but was not sustainable for a whole tankful due to my choice of route. If you have a bad headwind and must maintain 75 mph it is difficult to maintain anything above 10mpg. A properly setup trailer does not have a severe effect on the gas mileage.

I tow a boat with lead weights and was wondering id the H2 frames were built tough to decrease chances of tweaking out the frame. What is the tow capacity? I am sure the frame can withstand. ANyone have frame coating falling off, cracking, or flaking? Poor radio reception remedy?? That is my only and number one complaint. The radio gets horrible reception for some strange reason. Other than that its all good. any replies appreciated.

I am getting 13 and above and the range has gone to 398. I have the Volant air box and Corsa exhaust with a GMS air sensor.
At highwat speed of 75 to 90 it drops to 11 to 12. I will experiment with air pressure on my next trip.

Randy

To increae your fuel milage you can intall an xtremeflow power package that includes the exhaust, cold air intake and the flash programming you can pick up 70 HP nd 3 MPG. Check it out at www.xtremeflow.com

I just met a man from Seaside Oregon who told me he put a different air cleaner plus a computer chip of some sort on his H2 and now gets 14 mpg.... not being a mechanic, I only know he said it was approved by GM and installed at his H2 dealer.

(I fill the tank up when it's half empty so I don't have to embarass my H2 by standing at the pump for a long time filling the thing up!!)

Sue

I've had my H2 for a month now. Right after I got it (200 miles) I put dual exhausts on it. I've made two trips from Los Angeles to the Las Vegas area (300 miles). The first trip I got 15.0 MPG, and the most recent, 15.7. I only wish I would have made the first trip before I put the exhaust system on it, for comparison.

Well just hit 1,000 miles on my H2... I am averaging 10.4 miles... for all around driving... some highway mostly city.

I guess this is ok... afterall it a HUMMER

My 2000 GMC Yukon Z71 averaged 13 miles, I do miss my Yukon... :(

Guys,

We just hit about 1200 miles on the truck and it still shows around 10.9 miles per gallon. It really depends on how you drive it. I drive it like I stole it, so my MPG is really low, but if you are a really conservative driver and don't floor it pedal to the metal out of the pit every single time, you should be able to get a bit better gas mileage out of it.

The problem with the H2 is that it is full time all wheel drive, it is heavier than most SUVs on the road and the engine is just underpowered.

Once we get our 4WD Dynojet installed, we will dyno our 2004 H2 with a few thousand miles on it to make sure it is nice and broken in so we can get some baseline numbers on it.

We will do all the common bolt-ons like cold air intake, long tube headers, exhaust and then re-dyno it so we can see what we will get powerwise and see if MPG improves.

Once this is done, we will move up to a mild head and cam package bumping up compression and giving us a ton more power.

With common bolt-ons in addition to a head and cam package, we should be able to pick up some significant power, easing up stress on the motor since it is a bit underpowered giving us a result of better gas mileage and more power.

If the engine works less to deliver more power, we should be able to see better fuel economy as well as more fun while driving it.

Then we will slap on a supercharger on top of the bolt-ons and H/C and then see what the MPG comes up to be.

We will dyno the truck every step of the way so we can see how much power it is putting out.

We will keep everyone posted on gas mileage as well as power output.

I just can't wait to get the 4WD dyno in.

Maybe we should put together a SoCal dyno day for the H2s.

What do you guys think?

Shawn

Hey Zim,
9mpg here but, who cares it is the coolest truck I have ever owned....go and get one!!:thumbs

supercharging will not help your gas milage my h2 is a year old and i still get 10 mpg thats with supercharger and monster exhaust but it runs much better:party

I have about 6100 miles on my Sage Green H2. For last 1000 miles I have been averaging 11.4 MPG.

Will be taking a 2500 mile trip shortly and will let you know the mileage from that trip

I use 93 octane (where ever I can get cheap) Most of the time at SAM's

Love my Hummer

:party

Just about 1000 miles on my 04 Hummer.
Averaging 11.4 mpg using 87 octane gas.

I will also be taking a 2200 mile trip in December, and will post my results then.

I just hit 1800 miles. 10.5 MPG 1/2 city 1/2 highway. It's creeping up about 1/10th MPG per 500 miles.

Just finished our trip- From North Texas to Wisconsin we averaged 13.2 at 67 MPH average. Coming back, with the same speed, but heavy cross and headwinds, 10.8 MPG.

Could not believe our luck on the trip- no construction, little traffic and overcast skies with no rain or snow. We set the cruise at 75 and only stopped for fuel (3 x each way). We took the Oklahoma, Missouri, Illinois route, rather than I 30/I 57.

We are running Mobil 1 5w30

Love our Hummer

:party

with about 14,000 miles, i'm averaging just under 12.5 highway and just over 10 combined. making sure the tires are kept at 38-40 lbs seems to help a lot.

texascamper,

Sewell or Classic? I went with Sewell because they're opening a new location in Plano.

I bought from Classic Hummer- they already had the new store- and they do not put their name on the back of the car in 3 " letters. You would think that Sewell was making the payments on the vehicles I see around here. Classic had a small sticker on the back that they removed immediately at time of purchase:flag

At the 3000 mile mark, I'm getting a consistent 12 MPG in city with a stock H2. Just finished a 400 mile road trip and got about 15 mpg on the way there -- and 7 mpg on the way back (amazing what a 25 mph headwind will do!!!!!!). Could have also been the result of decreased aerodynamics due to a medium-sized bird lodged in my front grill. :)

Stacy

texascamper,

I know what you mean about the letters. I've bought from Sewell before and I could live with the letters that are stuck on the back door. I wouldn't get an exterior spare cover from them though because their name is way too big on those. They didn't have a vehicle with the options I wanted on the lot but found one within an hour in Louisiana with only 4 miles on it and had it on a truck that afternoon.

I started with Classic but they kept trying to push a truck on me that I didn't feel right about. The driver's side floor trim was scratched and parts of it appeared to be a little worn. When the salesman wasn't watching I pressed the buttons on the DIC and found it had 250 miles on it. I wish I had checked the hour meter. I did some research on the VIN number and found they'd had it on the lot since February 2003, obviously using it as a demo. This was in September. That was enough to send me down the road. They have a cool facility though. Impressive to see an H2 sitting 4 feet from you when you're in the sales guy's office.

When you think about it, they're both going to have their faults because they're car dealers out to make money however they can. :thumbs

Picked up my 2004 Hummer H2 from San Diego on December 31st. Highway 5 to San Francisco, averaging 75 mph, I got 13.5mpg. On my Jeep Cherokee I was getting 14.5-15 with mid grade gas. Yesterday I went to Napa Valley and got 12.6 mpg.
This is a great truck!!!! Anyone know where to get snow chains?:party

I took GM up on their 24 hour test drive. I picked up a 2004 H2 from the dealer in Paramus NJ. The vehicle had 800 miles on it. Took it up from NJ into NY on the NY State Thruway and back and drove it around the city a little before filling up. I averaged 12.7 miles per gallon. I did fill it up before leaving so I do know it was topped off..... Maybe I should buy that one..... I added 400 miles to their 800 before returning it.... Loved the vehicle... Only problem I had as vehicles passed and stared at the truck, they drove into my lane almost sideswiping me in their stupor...thumbs

I've got 19,000 miles on my beast now, and it still is getting just under 12 mpg.

Looks like I'm going to put the new air intakes on, and might consider that exhaust as well.

Picked up my 2004 Hummer H2 from San Diego on December 31st. Highway 5 to San Francisco, averaging 75 mph, I got 13.5mpg. On my Jeep Cherokee I was getting 14.5-15 with mid grade gas. Yesterday I went to Napa Valley and got 12.6 mpg.
This is a great truck!!!! Anyone know where to get snow chains?:party

I traded my H1 diesel for this H2 and I love this jeep and the jeep parts (http://www.racepages.com/oem/jeep.html). I've been driving for 14 months and no problems with solid rock. I got 12mpg at city and in highway at 60mph I get 18mpg.

I owned a H2 from 2003 to 2007 and I loved everything but the gas mileage so when the lease was up I turned it in. Next year I'm gonna get a new truck and I want a H2 but they have to do something about the gas mileage. If they can get it to 15 in the city and hwy I will get one. Does anyone know if the 2010 or 2011 have plans for better gas mileage?