Great question Brian. I have been wondering the same thing myself. Holding a constant throttle position in my TSX appears to show a constant instant MPG even though my speed is increasing.
I do know the ECM can override the throttle input you are giving. When it last snowed, I tried to get up my driveway with traction control turned off but I was too generous with the throttle and had too much wheel spin. Turning traction control on, I put the hammer down to the floor and the car very slowly accelerated, and I built up just enough momentum to get the car in the garage.
Computers doing the thinking takes all the fun out of driving, but at least it gets your car in the garage.
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