And also, because the Volt is quite a bit heavier than the LEAF, it will get less of an increase in efficiency by driving more slowly than the LEAF does, and the extra weight will produce a larger decrease in efficiency in "stop and go" traffic or on roads with ascents and descents requiring regenerative braking, than it will in more level and constant-speed driving.Pipcecil wrote:As a leaf and a volt owner I can say that the volt in all EV mode, handles the highway speeds significantly better than the leaf. I attribute this a lot to aerodynamic efficiency. The leaf is a larger vehicle, so it will create more drag than the volt. In addition the volt has a very low ground clearnance - my wife scraps bottom every day leaving the driveway. She never had before even when she owned a two-seater sports car. The lower profile is a big aerodynamic saver at high speeds, which is why tesla has the air suspension thingie that lowers the vehicle at high speeds and semi trucks us that plastic paneling to cover up under the trailers.
Those two together I think make a good difference. As for the powertrain, I still think the leaf's is more efficient (i.e. see the EPA's MPGe, 94 vs 99). The higher your speed, the less effiecient (exponential) really points to the aerodynamics of the car.
So, while on trips in your LEAF where driving speed averages 35 rather than 70 mph, you typically see a reduction in range of almost 50%, in the Volt, you typically only see a reduction of what-maybe about 40%?