My idle is open loop no o2 sensor feedback. My cruise is spot on though.

These injectors/tuner (tscomp) are what fixed my bad mileage.

 

Nice! You weren't in idle open loop to begin with were you?

I have the same injectors and love them.

 

Did you figure it out? I'm having the same issue with 16mpg no matter how I drive.
Although I'm running a PTE 6266 @ 28psi so I'm not sure if that is the reason for my poor MPG.

 

I'm blaming my **** mpg on ID's on the fact that the stock ecu for evo 9 doesn't seem to have a fuel cut when you lift off the throttle it hangs 5-10 seconds then cuts.

 

My previous tune was in open loop with other injectors was in open loop yes. Tom got it squared away

 

With a big turbo like that you tend to stay out of boost during driving. It could be a number of things causing your poor MPG. I pretty much changed everything that deals with MPG till it was fixed.

New
UEGO sensor
Front o2
Tires
Fuel pump
Injectors
Air filter

And I'm good now

 

Tuner should be able to fix that for you.

 

I have a feeling that it could be my front o2.
Will get it replaced and report back.

Thank you !