Porsche has already subjected its third-generation Cayenne SUV to a facelift and technical update, giving us the V8-powered S and plug-in hybrid electric vehicle (PHEV) E-Hybrid models already. But now, the German company is adding more variants - and they're all PHEVs. The high-power Turbo E-Hybrid and Turbo E-Hybrid with GT Package cars replace the old Turbo S E-Hybrid, and there's an all-new derivative, the Cayenne S E-Hybrid tested here. Does it make sense as the best balance between economy and performance?

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