I parted out most of my car quite some time ago and only have MMI, FSB and TS F-Spec still on the car due to PITA removal.

I had TS flash it for just a CAI mod when I first got it, but now the ECU is the only "go" mod that I have. My question is if the gas mileage would/should be BETTER or WORSE with the F-Spec instead of the factory ECU if driven civilly?

Thanks,
Daniel

 

I don't think you'll see much difference, at least not worth having it reflashed again.

 

I forgot to mention that I still have my STOCK ecu as well. Two ECUs total, TS flashed in car, and stock ECU in closet.

 

Why don't you drive it and compare it to what others are getting?

 

har har har

I'm currently getting about 19mph averaging city/highway miles, and that's with the cold weather now.

 

I don't see why the reflash would make it run any more rich under normal driving conditions, you SHOULD get the same mpg.