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How did MetroMPG reach his conclusion? I'm sure there's an aero difference between a brickish SUV and a hatchback at 30 miles/hour, but a smooth sedan like a Civic and hatchback Prius would be virtually nothing. The weight would matter more (because of the stop-and-go pattern of city blocks).
For example the Volt that I tested:
It wasn't very aerodynamic, but still only used 5000 watts to maintain 30 miles/hour versus 50,000 every time I accelerated from a stop. A lightweight car like a smart would be about half that (which is why its EPA city score is nearly 40 mpg). IMHO weight matters more when you're constantly stopping & starting (wasting energy).
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