Drive by wire is the term used for electronic throttle control.
a cable has instantaneous throttle response.
A wire must rely on ADC's and DAC's as well as a computer to open the throttle.
Not saying you'll notice the difference.... but I am say you wont notice the difference in throttle response.
The fueling isn't controlled by the throttle plate, but rather the MAF and O2 sensor.
And any fuel economy gains will be negated by the extra 200 lbs you have to lug around.
Swan racing's are....