Assuming a dumb operator, what would probably be best is a CVT with selectable programming. Just put a fuel economy button on the dash aggressively switching the programming of the CVT toward fuel economy. I guess by now the general public kinda know the basics on driving for fuel economy (at least the kind of person that would buy a Versa). So if they press the fuel economy button I guess they would assume and accept the car behaving differently than with the regular "performance" setup.
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