Originally Posted by
cdelong
try running the box back to back without the box. you will find you need to lean the engine 1/4- 1/2 with the box on with a barely noticeable loss in power.... hence the better fuel mileage.
Exactly... I was running the car without INS box, and when I installed it, the engine became way richer immediately, simply because fuel/air ratio got higher. I leaned the engine and it was running a little down on power but better on fuel.
I personally dont use it if I dont have to, and if I dont need runtime.