Horrible gas mileage.. something wrong?

[Drizzle]

Hey all.. just joined the forum.. I have a 2008 Yukon SLT, and I was wondering what kind of MPG others are getting? The rating is 14/19, but I am averaging 13.6 after 15,000 miles. Tire pressure is 36, air filter clean.. 70% highway miles... easy on the accelerator...87 grade fuel.
So I am wondering if there is something wrong with it.. I am not expecting 20 MPG, but it seems like it should at least be in the 14/19 range they advertise..
Thanks for your input!!

[baron]

Are you going by the built in computer or are you calculating your own ratings? I find the built in to be off.

[Drizzle]

the built in display reading is 13.6 MPG average. I haven't ever reset it and have 15,000 on the car. Not sure how many miles it uses to figure it, but it has always been between 13.4 and 13.6. I did figure it over one tank of gas once and it was about 14.. so I figured it was accurate...

[stevek]

It isn't completely accurate. How fast are you going on the highway? When the EPA makes the mileage ratings, they accelerate at 3.3mph/s which I find nearly impossible to do with all the power under my right foot. I'm getting I think 12.7 with my Denali which has the bigger engine and the 6 speed.

http://www.fueleconomy.gov/feg/fe_test_schedules.shtml

[Zed 71]

I am assuming you have the 5.3L engine and 4-speed auto. Do you have 4 wheel drive and are you stock?

I have an 07 Z71, 4x4, 4.10 final drive. Stock I was getting ~16 mpg city and ~19 mpg highway (around 70 mph on flat road), based on hand calculations not DIC. Now leveled with mud tires I get ~14 mpg city and 16 mpg highway.

[tx07tahoe]

I get 12. Are you the orginal owner?

[07Burb]

It isn't completely accurate. How fast are you going on the highway? When the EPA makes the mileage ratings, they accelerate at 3.3mph/s which I find nearly impossible to do with all the power under my right foot. I'm getting I think 12.7 with my Denali which has the bigger engine and the 6 speed.


According to my DIC this is exactly what I am getting as well in my Burb...

[felixgun]

Mine stays at 14.3 city/~16 avg highway

[stevek]

According to my DIC this is exactly what I am getting as well in my Burb...

So am I getting good mileage, or you bad?

[07Burb]

I think you're getting about average to be honest with you. You're getting about what I'd expect.

[Drizzle]

Yes, original owner, but it had 3000mi when I got it. It is 4 wheel drive, stock - but I rarely have it out of 2wd... mostly flat road driving in MI typically about 60MPH.
Sounds like it is a little lower than it should be, but probably nothing I can do about it.
Thanks for your input!!

[brucebruce45]

take out spare tire, 3rd row if you don't need it, wax tahoe, run 40 psi in tires, etc

[noob]

I get 14.5 mpgs mixed driving using 93 octane without ethanol, it gets worse with the gas with 10% ethanol. I get about 18 mpg on the highway at 70mph. I have the 6.2l with 6 speed in my escalade.

[sumo]

if you have 4x4 make sure you didnt accidentally knock it into auto. Ive done it a few times with my knee getting out of my truck.