Re: Tuning Box for 2.4 159???
The computer is no longer accurate after you fit a tuning box.
The consumption is calulated utilising the injector pulses from the ECU.
What the tuning box does is intercept the injection pulse from the ECU and and it longer in duration, so you are using more fuel than the computer thinks you are.
This does not necessarily mean that you use more fuel though as a lighter pedal wil produce more torque at lower revs than standard, if you dont adjust your behaviour though, you will use more fuel.
A remap will have more flexible strategies than a tuning box, which relies on the standard ECU logic and looks at what its doing and decides where/when to increase injector pulse duration.