The fuel consumption is great, i dont however drive over 120kph. I drive as per road speed limits indicated.
offroad i might go down to 14l per 100km by driving in low gear and high engine loads. but on the road its closer to 10l per 100km then 11l
econokit cools down your inlet airtemp by letting the engine suck in water vapor. They might claim it does more than that, but as how i see it, its just simple water vapor. and it works great and makes the engine produce less black smoke (but the tritons almost never do that anyway). the main thing is it lowers fuel consumption, thats if you dont use your extra power created by the cooler air. And its better for the environment (it reduces CO2,NOX, CO so they say).
So i could take out without bad feelings the Catalitic converter, EGR and put an open 3" exhaust, bigger turbo and boost up the fuel pressure