It's not that difficult to see the throttle position sensor values, via OBD-II with something like a ScanGauge.
My car's ECU reports the TPS values, and I don't think it even has electronic throttle control.
I address e-ink before (basically for me the contrast sucks) but most people hot on ereaders seem to like it:
"The fundamental principle of science, the definition almost, is this: the sole test of the validity of any idea is experiment." -- Richard P. Feynman