From a book on the SMART Car,there is this shot of their SMART Roadster and Roadster Coupe'
*the cars are identical except for the roof.
*with 82-bhp,the notchback's top speed is 109-mph.
*with 82-bhp,the fastback's top speed is 112-mph.
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*the fastback is 2.75% faster.
*according to Hucho's metric,the fastback has 8.25% lower drag.
*and a little over 4% better HWY mpg.
