only mod on my engine is a short ram. im getting like 22 mpg on my ls motor, and when i gun it near redline, gas goes down pretty fast. i dont have a heavy foot either, and i barely even take my car up to redline. could this be my o2 sensor dying? i have like 120,xxx on my motor currently. any suggestions would hlep

 

run a check on your compression, replace your 02 sensor/s, check your spark plug gap, and clean your injectors.