mpg on my 04 5.3 Yukon

Juice17

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Hi everyone, I was wondering if 12.9 mpg combined is normal on my Yukon with 150k miles. What can I can check, clean or replace on my Yukon for better gas mileage besides better diving habits. Any help is appreciated. Thanks
 

Project Denali

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Ignition: new spark plugs, coils, and wires (possibly upgraded as well)
Air: new filter/clean and oil if aftermarket KN style, and new PCV valve or if integrated valve cover style, remove and clean, also run some seafoam through the engine running
Fuel: try an injector cleaner of your liking

It is all relative to your rear gearing, your tire and wheel size if not stock, and like mentioned above a tune can always help!
 

Mudsport96

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It all depends man. My wife gets 2 mpg less than me with her style of driving than my way of driving. Which boggles my mind because i drive 70 everywhere i go unless in town of course.
Then there are location factors. Is it hilly or flat? High altitude or lowlands. All this plays into the formula.
 

9C1C

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I've gotten as low as 11-12 around town and 16-17 on the highway, generally getting 13-14 most of the time due to combined driving. I have an 04 Yukon 4x4 5.3 with 295/75/16 AT tires.
 

Doubeleive

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90% of it is how you drive, just the way it is. I can get 7.5 or 14 DEPENDING on how I drive.
Brake pads can last you 5 years or me 6 months DEPENDING on how I drive
lowering the vehicle and weight reduction can help in addition to how you drive
 
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