Gas mileage.... Is this normal?

[gixxersixxer]

Highway Gas mileage.... Is this normal?

Hello all. I was wondering if there is a way to improve my hwy mileage? My city I feel is on par with 12.5-13.5. However my hwy miles on the other is horrible. Last time I checked my hwy miles during a trip I was getting I believe 14.3 or 14.5 mpg... I didnt buy the vehicle for gas mileage but this no where near the advertised mpg on the vehicle. It's an 05 Yukon Denali. I dont tow anything and I'm pretty easy on the throttle all the time. I just bought it 2 1/2 months ago. All I have done to it maintenance wise are new fluids in the front diff, rear diff, transfer case, and tranny (fluid and filter exchange). Is there any way to improve the gas economy? Any maintenance items I should try that might help? I tried to locate the fuel filter and I cannot find it! Thanks.

 

[ATL]

thats about right for mpg, im showing about the same with my 03 denali. best thing you can do for you mpg is install 05+ electric fans and a black bear tune. you could try 5w20 oil, check tire pressure, maybe a tune up...???

 

[gixxersixxer]

Doesn't my denali come with efans already?...

 

[ATL]

i dont think so, i may be wrong, but i dont think the suv fans went electric til the nnbs

 

[Rivieraracing]

Doesn't my denali come with efans already?...

You should have electric fans, since yours is an '05!

 

[gixxersixxer]

^^^This is what I thought. If I am correct they were in 04+ correct... Can anyone tell me where I can find my fuel filter. I have traced the lines under the car and I have yet to find it. I am going to replace that, that might be one more thing that has not been replaced that needs to be.

 

[Nick05LT]

My 05 Tahoe w/5.3l I get 15-16 in town and 18-20 on the highway.

 

[Big O]

05 yukon 5.3 70k miles

12/13 in town
15/17 hwy (80 mph)

 

[Sasquatch]

^^^This is what I thought. If I am correct they were in 04+ correct... Can anyone tell me where I can find my fuel filter. I have traced the lines under the car and I have yet to find it. I am going to replace that, that might be one more thing that has not been replaced that needs to be.

I have an 05 yukon and the fuel filter is located in the gas tank, It`s good for the life of the fuel pump. I`m not sure when they started putting them in the tank but i think it was in 04-05.

 

[robstor]

The best thing you can change to get better mpgs is putting a under drive pulley setup. it reduces drag and will give more power n better mpgs.

 

[chauncey0337]

Isn't the fuel filter in the frame rail under driver side door?
http://tahoeyukonforum.com/forum/showthread.php?t=34863

 

[04SS99Denali]

mine averages 14.1 with 70% city 30% highway. i think thats pretty good considering its size

 

[M3PO]

OP
one thing not yet mentioned: where are you located? Your location is not by your screen name.
I'm in the midwest and my MPG drops considerably in the winter. Many blame it on "winter gas", I feel it is due mostly to the engine running rich while cold, taking a long time to heat up, and many people start their truck before they drive (weather it be seconds or minutes). Despite the reason why, most agree winter mileage is considerably less.

BTW, my Denali gets about 16.5 all highway in the summer. Winter all highway, 14.5-15. Winter city driving- short trips, long warm up times, I can get as little as 10 mpg. 06 Denali.

Just my opinion

 

[chauncey0337]

Is that why gas prices go down in the winter, because of crappy winter mixture?

 

[JochenWoern]

My 05 Tahoe w/5.3l I get 15-16 in town and 18-20 on the highway.

Is this a two-wheel drive? Heck, I sure hope so. And you must be running the original size tires on it as well, you most likely NEVER put your foot into it.

I do not get more then 13 on an average according to the DIC per tank of gas. Even on the freeway, cruise on at 70mph and around 2000rpm I have NEVER seen better then 16.

Now I have to admit, I run 32 psi in my tires to get the most life out of them. I would assume I might get another 1 or 2 mpg if I would inflate up to 40psi.

 

[Big O]

dont trust the DIC

 

[JochenWoern]

dont trust the DIC

So what are you saying? Calculate it the good ole fashion way?

 

[05Yukon23]

So what are you saying? Calculate it the good ole fashion way?

Calculate by hand for sure. Sometimes the DIC is pretty close but others I have had it as much as 1.7 mpg off of what I was truly getting. Today, for example, the DIC said 19.5 and by hand I was getting 18.3.

 

[Tahoebigdog03]

Good thread.

 

[DenaliAK]

Is that why gas prices go down in the winter, because of crappy winter mixture?

Gas prices go down in winter because there's less demand and more supply. At least in theory. They haven't done much here one way or another in about 9 months.

'03 Denali here. Summers on 32" A/T tires I get about 17-18 mpg highway, 13-14 city. Winters it goes way down. I've done almost no highway driving this winter, am running on some Blizzak winter tires, and I'm getting about 12 mpg. There's more drag much of the time due to snow and other road conditions, not to mention sticky tires. I also generously use the auto-start, so I probably burn about an 1/8 of each tank idling.

There are a lot of variables, especially if you're in an area impacted by winter weather. Driving habits, tires, terrain (do you live in the hills? That makes a big difference in these...), etc.