[JasonblkZ06]

I used to get 18-20 mpg mixed highway and city driving and now get around 15-16 mpg. I am not sure what could have changed. Driving style is the same, type of driving, and air pressure in tires is the same. I have changed the fuel filter. What about boost leaks? I guess I will check that next. Any other ideas?

 

[JasonblkZ06]

Yes fuel pressure gauge reads the same. I am in the process of replacing the lift pump just to get rid of it. It might be the brakes dragging as I am in need of serious brakes which is next once the lift pump is done. I will clean the IAT and maf sensors as well and report back.