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Improve Gas mileage question....
And Castrol edge 5-30 oil K&n oil filter- Cobaltdairy
- Post #21
- Forum: Engine & Drivetrain
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C
Improve Gas mileage question....
I got my 03 yukon not a xl or suburban length and it got 15.4mpg when I got it 2 tanks later it got 12. 4 Coils tested bad or week Plugs were red and melted tips down and ngk r plugs the guy said he put in but ya don't trust used vehicles much anyway . So it missed and run ruff and I decided to...- Cobaltdairy
- Post #20
- Forum: Engine & Drivetrain
