16 mpg combined city highway, base automatic. I can live with that.

The results are in. On my FIRST tank and more city driving than usual with a base model and 5 spedd I'm getting 17.75 mpg avg. I am an engineer and my math is fine. I think 20+ on the highway is very obtainable. I'm hoping for 18+ average. That's pretty for for this class of vehicle. I'l switch to my usual synthetic oil and gain possibly as much as 1 mpg.
I'm not complaining. It's definately better mileage than people think I get.

Just over 13 MPG with todays fill up

But it is getting slightly better

GOOSEY,

H3HUMVEE is claiming 20+ AVERAGE (city/hwy mixed)

We looking for anyone else getting that...

RYD

I'm sure your calculation of 17.75 is reasonably accurate. The hope of 20 mpg is not realistic if you drive normally. And the hope of synthetic oil adding 1 mpg is a dream. Enjoy your new H3.

S.

I'm sure your calculation of 17.75 is reasonably accurate. The hope of 20 mpg is not realistic if you drive normally. And the hope of synthetic oil adding 1 mpg is a dream. Enjoy your new H3.

S. </div></BLOCKQUOTE>

We'll see. I am driving under 65. It seems like a lot of people are right now. In my last vehicle I got .9 mpg better using synthetic, but that was an equinox and more aerodynamic than the hummer, not shaped like a brick. I'll run a few tanks through this one, and post it here. I'm pretty sure I can squeeze 18+ average on my use.
PS: Being an engineer my math is ok, but spelling? Whew!

We took a roadtrip to Colorado and back in the H3. At speeds of 70MPH, we got like 16-17MPG. When the speed limit went up to 75MPH, we got more like 13-14MPG. A lot of wind in some places didn't help, as we had to fight to keep it at 75.

My H2 at 70MPH gets 15 MPG.

It's that driving under 65 thing on the freeway that doesn't happen here in California, it's not safe to do so. Maybe at $5.00 a gallon?...



S.

Have had a few more first tank replies at our dealership and over the last week or so, maybe 10 more replies, the best is 18.3 with the owner guessing about 80% highway.

Last 4 tanks were 14.7, 15.4, 15.78, 15.76 running around Silicon Valley. Maybe I'm doing a little more freeway than usual, since I normally average just below 15mpg.

S.

Still no 20+ average city highway.

Oh well H3HUMVEE is a lucky guy...LOL

RYD

Ok, I have been putting premium (91) gas for the last 9 months and my last fill up I used the 87 octane and my mpg dropped to 10.2 All city driving, same way to work, School and home. I was getting around 12.5 to 13.5 on the 91 octane. I'm using Chevron and I think the 87 burned faster than the 91....well that's my theory.

I don't think Hummer/GM claimed more than 20 mpg on the hwy?

H3 EPA ratings:

auto 16/19mpg
manual 16/20mpg

For what it's worth...

after putting on my tires i'm about 15/16 now.

so i bought a civic!!!

the H3 is now my official off road vehicle and for long family trips!

Re: GAS MPG
 

Just finished a 227 mile interstate run and recorded 18.01 mpg with the automatic trans running with the crusie on @ 70 mph.

Re: GAS MPG
 

On our latest trip, we drove 60MPH all the way out to Colorado. The highest MPG was 23. The others I calculated were between 21-23 depending on the terrain and amount of stop/go off the interstate. So at 55-60MPH, I can now say that our H3 has beaten the EPA ratings.

However, raising the speed even 5MPH drops the mileage considerably.

By contrast, the H2 got about 11-12 MPG with a 12 foot box trailer. So you can see what driving slower really does. Moving up to 65MPH, the mileage drops to like 8-9.

Re: GAS MPG
 

i have gotten 21.3 running 60 mph too :D

Re: GAS MPG
 

" OK - GIRLS,,, LISTEN !!!

WHO - meaning you all out there---

BESIDES H3HUMVEE is getting 20+ A V E R A G E city/highway...???

ANYONE ? remember AVERAGE!

HUH?

I didn't think so... remember math skills are important here!!!

RYD

Re: GAS MPG
 

From the EPA Website:
Your vehicle's fuel economy will almost certainly vary from EPA's fuel economy rating.

Fuel economy is not a fixed number, it varies based on

Where you drive
How your drive
Many other factors
The EPA ratings estimate the MPG a "typical" driver should get under "typical" city and highway conditions. However, most drivers and driving environments aren't typical, and the factors that affect fuel economy can vary significantly:

Driver Behavior & Driving Conditions
Vehicle Condition & Maintenance
Variations in Fuels
Inherent Variations in Vehicles
Engine Break-In
So, the EPA rating is a useful tool for comparing vehicles when car buying, but it may not accurately predict the average MPG you will get.