well if your tuner knows what hes doin, he can dial in your trims, give u a safe afr and timing through out your rpms. Like me in 5th gear if i can stay around 65-75 which is less then 3500 on my tach which with the fp red im barely gettin into spoolup rpms, **** ive made it from my house out to indio which is about 70 miles away not even hittin a 1/4 tank(so 23-26mpg), well part of that is its windy and the wind goes with me on my way out there, and against me on the way back but you catch my drift. Its just all in how your tuner tunes your car.

 

Very useful info, I was planning on replacing the injectors with stock ones but at this point I do not see why should I if they do not affect the mileage.