I like the thought, but would be unwilling to give up that other 25% just to gain the extra resolution. I see no reason this wouldn't work though. The bigger question is whether the effort will result in measurable fuel economy improvements. I'd like to see you test it.
In high school, I built an electric "car" that was a reverse trike design made of aluminum and custom built bicycle wheels. This was entered into the PGE (Portland General Electric) sponsored 1hr endurance races against other schools. I mention this because I thought about how difficult throttle control was on a bumpy road combined with the imprecision of a shoe-covered foot. I designed the throttle into the steering mechanism to help isolate bumps and increase precision. The design resembled the handle of a pull-starter and was operated by placing the wood-carved handle between the index and middle fingers and pulling towards the driver. This actuated the spring-loaded POT.
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