A "simplistic" analysis based on real-world data is more reliable than complex theory. A good starting point is the energy consumption all night vs the energy consumption during the morning burst. Even if your car is more efficient driving at highway speeds, you're still better off leaving it parked all night and getting worse fuel mileage during your morning commute than driving further than you need to go just to get better average fuel economy. Energy storage is a better long-term solution to the peak demand problem utilities are grappling with now, not recommendations that lead to higher energy consumption.