People ofte underestimate the impact of aero drag on city fuel economy. Play around with the
aero + rolling resistance calculator to see this.
EG. at just 25 mph, ~40% of my car's fuel consumption (in stock form) goes to overcoming aero losses.
Quote from a GM engineer regarding the Volt: "Aerodynamics can give a much larger boost to the range of an EV than decreasing the weight of the vehicle. These results were fascinating and hold true in both city and highway driving conditions." -
source