Scangauge Xgauge -make a new gauge via math operations on existing gauges?

So many of us have now used the Scangauge successfully; however a point of good feedback while driving is a single metric to indicate how efficient we are as drivers. The MPG gauge gives us this metric for the most part.

But, during acceleration, its nice to know how effectively we're using fuel. For this, I'd like to make a new Xgauge for acceleration effectiveness. Essentially, its the derivative of mph divided by fuel burn rate. This works out in metric to m/(s*kg_fuel). (You could consider the inverse just like mpg w/ l/km if you like). The higher this metric (or lower the inverse), the less fuel is used per unit of velocity added.

To make such a metric, I need to do a little math in the Scangauge. I need to make a pseudo derivative w/ 2 mph readings and the sample rate, and then average the fuel flow rate for the two samples also to divide by. Are there any experimenters out there w/ the Scangauge that have knowledge that could get me started?

Admittedly, I'm adding this gauge for my other car, not my prius, to see how this changes with gear ratio and engine load. But, I feel it would be an interesting trend to follow in the prius nonetheless.

 

The single variable limit is what I had feared. So it looks like unless I were to get myself into chip programming mode and essentially 'hard-code' a new gauge in scangauge, this will not be possible.

This isnt really possible w/o having the original assembly or C from linear logic- since what's on the chip already will be compiled. I do remember hearing talk about a USB link between the scangauge and a computer for data-logging etc. Does anyone know if that will be available in future releases? It would at least provide the first step w/ hardware for easy reprogramming for new CAN data or my application, provided one has the original code to modify.

Thanks for the reply.