Have a look at the solar endurance cars; they are pretty interesting on their own, and have had some "functional" designs over the years. It's possible to make

Have a look at the solar endurance cars; they are pretty interesting on their own, and have had some "functional" designs over the years. It's possible to make a sedan sized car that can be power positive at highway speeds in summer; even with modern safety and features. It's the rest of the year...