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Gas Mileage?

roger.mcneal

By roger.mcneal
in Ask A GM Technician

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roger.mcneal Enthusiast

roger.mcneal

Posted
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I have an 07 Sierra nbs (w/ active fuel management) an i am only getting 220 miles per tank of gas. I have replaced plugs and wires and ran a injector cleaner (techron). I have the ability to use the tech 2 at my shop but i was just wondering if anyone has had any problems like this and where i could start with troubleshooting... I have had the truck almost 6 months and I was getting about 350 miles per tank in town. Something isnt right....

GMstrong Enthusiast

GMstrong

Posted
Posted

The only injector cleaner i use is 3m.How about the fuel filter,fpr?youll be surprised what a nice new drop in k&n would do!

roger.mcneal Enthusiast

roger.mcneal

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The only injector cleaner i use is 3m.How about the fuel filter,fpr?youll be surprised what a nice new drop in k&n would do!

 

I don't think the fuel filter is serviceable. I think the fuel filters in the newer gm trucks are located inside the fuel pump, correct me if im wrong. I will be getting a K&N soon, not sure if i will go with a whole intake system or drop in...

gm4yrs Enthusiast

gm4yrs

Posted
Posted

Do you have a locking gas cap? Just an idea, people may not notice 5 gallons missing, if mileage isn't checked. I fill the tank every 75 miles with $20. ( $3.55 a gal.) Take notice of gas cap position, if it is parked outside or in parking lots.

jro909 Senior Enthusiast

jro909

Posted
Posted

don't fuel tanks have a couple of screens in the fill neck? the average criminal is lazy when it comes to doing work to gain something

markw8 Enthusiast

markw8

Posted
Posted

Do you live were it's cold? Change brands of gas? Has it been left idleing to warm up? Also has this been over multiple fill ups? Many things in winter can cause a mileage drop. I would save the money for the K&N. I would be better spent on gas. The stock filter will flow plenty.

 

Unless your truck was extremly high mileage, you wasted plugs and wires. They just don't go bad like years ago. Oem plugs will go 80,000 + miles. GM says 100,000.

 

Mark

roger.mcneal Enthusiast

roger.mcneal

Posted
  • Author
Posted
Do you live were it's cold? Change brands of gas? Has it been left idleing to warm up? Also has this been over multiple fill ups? Many things in winter can cause a mileage drop. I would save the money for the K&N. I would be better spent on gas. The stock filter will flow plenty.

 

Unless your truck was extremly high mileage, you wasted plugs and wires. They just don't go bad like years ago. Oem plugs will go 80,000 + miles. GM says 100,000.

 

Mark

 

Yes I live in ND, but I have had other vehicles that I let idle alot longer and not have that tremendous amount of drop in mpg. My truck hit 100,000 that is why I did plugs and wires. I have filled up about 4 times and its the same. The weird thing is that my average mpg on the display still says 15.4mpg...

txab Senior Enthusiast

txab

Posted
Posted
I have an 07 Sierra nbs (w/ active fuel management) an i am only getting 220 miles per tank of gas. I have replaced plugs and wires and ran a injector cleaner (techron). I have the ability to use the tech 2 at my shop but i was just wondering if anyone has had any problems like this and where i could start with troubleshooting... I have had the truck almost 6 months and I was getting about 350 miles per tank in town. Something isnt right....

Use the tech II and see what you find

RVJ Enthusiast

RVJ

Posted
Posted

There is a possibility that if your always buying gas at the station and pump that it is out of calibration.

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