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2009 6.0 Mpg

macguy

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macguy Enthusiast

macguy

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i've read many posts about gas milage, but am wondering if GM changed something in emissions, or the motor from earlier GMT-900 versions. My 2009 6.0, highway at 70 averages 13.2 dic, and 13.5 dic at 75. Granted I have some hills, and climate set to auto. Still much lower than waht I have seen and I'm not towing or carrying any weight.

Stevens03 Senior Enthusiast

Stevens03

Posted
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I average around 13-14mpg intown and 16-18mpg highway. Mileage drops hard above 65mph.. so if you keep it below there, you'll see the 17-18mpg your window sticker states. :shakehead:

jf781 Enthusiast

jf781

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I'm guessing that your drive a 3/4 ton not a 1/2. If your getting that then your doing pretty good considering you moving 3+ tons at that speed 75 MPH.

 

I would take that and be happy. I've seen a lot of people with the 6.0 getting 10.

macguy Enthusiast

macguy

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I'm guessing that your drive a 3/4 ton not a 1/2. If your getting that then your doing pretty good considering you moving 3+ tons at that speed 75 MPH.

 

I would take that and be happy. I've seen a lot of people with the 6.0 getting 10.

Yes its 3/4 ton 4x4. Curb weight is 5950. My F150 was also around same curb weight , slightly bigger, and averaged 15.5 similar gearing 6 speed auto and 3.73 axle.

jf781 Enthusiast

jf781

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Add in gas plus you and I was close to weight. The F150 and the 3/4 Chevy are two completely different beasts though with different capabilities. How many miles are on Chevy? Might take a little bit to break in I noticed mine climb about 1 -1.5 over the first 5k as everything worked in.

macguy Enthusiast

macguy

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Add in gas plus you and I was close to weight. The F150 and the 3/4 Chevy are two completely different beasts though with different capabilities. How many miles are on Chevy? Might take a little bit to break in I noticed mine climb about 1 -1.5 over the first 5k as everything worked in.

 

I know they are different, though towing capacity on the F150 was 11K, compared to to 96K on the silverado. Currently have 1900 miles and changed oil at 1000 miles. Running BP & shell regular unleaded, and premium every other fillup. Tire pressures, 50 front, 70 rear

jf781 Enthusiast

jf781

Posted
Posted

I'd honestly say your doing pretty good overall. Sounds like your doing everything right. Drive it and enjoy it.

 

I would drop the rear pressure to 45/50 if your not towing/hauling anything. Won't get you any better mileage but it'll smooth out the ride a little. Bump it back up when you do need to haul/tow.

 

BTW - I don't think we've ever seen pics of your truck?

hockeypro1411 Senior Enthusiast

hockeypro1411

Posted
Posted
Add in gas plus you and I was close to weight. The F150 and the 3/4 Chevy are two completely different beasts though with different capabilities. How many miles are on Chevy? Might take a little bit to break in I noticed mine climb about 1 -1.5 over the first 5k as everything worked in.

 

I know they are different, though towing capacity on the F150 was 11K, compared to to 96K on the silverado. Currently have 1900 miles and changed oil at 1000 miles. Running BP & shell regular unleaded, and premium every other fillup. Tire pressures, 50 front, 70 rear

 

 

:P Talk about a tow beast!

macguy Enthusiast

macguy

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Wondered how long that would take before some jumped on that one.

I mant 9600K. Something wrong with my editor or browser as it wouldn't let me edit.

ATMINF Enthusiast

ATMINF

Posted
Posted

Why are you switching back and forth with the 87-92 fuel? The computer will never adjust to the higher octane and run like it always has 87-89 in it. It usally takes several back to back 92 octane fill-ups for the computer to "learn" that it has the "better" fuel and then raise the timing a bit(thus giving better power and fuel milage). Or if you get a tune and then the truck computer expects the 92 fuel and thus you get the higher power and milage. Also it is not unknown for these motors to take 3-6K to get "broken-in". I hope this helps.

macguy Enthusiast

macguy

Posted
  • Author
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Why are you switching back and forth with the 87-92 fuel? The computer will never adjust to the higher octane and run like it always has 87-89 in it. It usally takes several back to back 92 octane fill-ups for the computer to "learn" that it has the "better" fuel and then raise the timing a bit(thus giving better power and fuel milage). Or if you get a tune and then the truck computer expects the 92 fuel and thus you get the higher power and milage. Also it is not unknown for these motors to take 3-6K to get "broken-in". I hope this helps.

Ok, I will use regular, as I was experimenting on how much I save with premium for .20 more per gallon.

Nick The Great Senior Enthusiast

Nick The Great

Posted
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I'd be curious about going 60 - 65. With the 3.73 gears in my truck, my MPG drops significantly the closer and further above 70 I go. (I can't help it though :P )

 

But if I'm on state highways at 55 or 60, it's MUCH better! :P

macguy Enthusiast

macguy

Posted
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I'd be curious about going 60 - 65. With the 3.73 gears in my truck, my MPG drops significantly the closer and further above 70 I go. (I can't help it though :P )

 

But if I'm on state highways at 55 or 60, it's MUCH better! :P

 

Even 70mph is slow for me. My commute is 100 miles per day, mostly highway, though 6 miles off road getting to and from highway.

Nick The Great Senior Enthusiast

Nick The Great

Posted
Posted
I'd be curious about going 60 - 65. With the 3.73 gears in my truck, my MPG drops significantly the closer and further above 70 I go. (I can't help it though :P )

 

But if I'm on state highways at 55 or 60, it's MUCH better! :P

 

Even 70mph is slow for me. My commute is 100 miles per day, mostly highway, though 6 miles off road getting to and from highway.

 

 

:crackup: Then I think for a 3/4 ton Heavy Duty truck going 75mph on the Interstate, 13 or 14 is good! :crackup:

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