Does anyone know if there is an on-board computer (OBC) add-on available for the S that integrates info from either the ecu or the fuel injector frequency and dose and the odometer to calculate and display instantaneous and cumulative miles per gallon? I am not interested in gadgets that estimate MPG using vacuum pressure. The OBC in my 1997 BMW Z3 shows cumulative MPG and other related info that is quite useful when determining the most efficient speeds and gears.

 

Dunno.....might wanna shoot Modifry or MacGyver a PM. They are both good with electronics. Modifry designed the DCI for the radio and MacGyver is an electrical engineer.

John