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:
"People should have access to the data which you have about them. There should be a process for them to challenge any inaccuracies." -- Arthur Miller