Several Mercedes-benz hybrid prototype cars will appear at this year's Frankfurt motor show in September, the company announced recently. Among the prototypes will be an S-class powered by a diesel-electric system developed with GM, and several gas-electric versions of its CLK, which will be available for test drives (could that be why the show added an extra press day?). No word on production, yet, but expect a Frankfurt press event announcement amid dancers and baloons.
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