Oh, I did. Here’s a link to an NPR story about monitoring drivers to improve their driving efficiency. It turns out that you can boost mileage 10-20% if you give people feedback about the cost of their bad habits.
As part of my thinking about EVs, I’d considered starting a company around this idea. It turns out that putting useful computers into people’s cars is both painful and expensive. You’d have to save a lot of gas to make this work. That doesn’t mean I’ve given up on it though…