Cayenne S e-hybrid is not a Cayenne hybrid. Totally different car. One is a plug in with a massive battery, one was a traditional hybrid that frankly was outshone by it’s diesel sibling. The hybrid was phased out.
S6 is a great option. No headroom though so its out.
Cayenne S Hybrid 2010-2014 2,995 cc (3.0 L; 182.8 cu in) V6 333 PS (245 kW; 328 hp)@5250, 440 N·m (320 lb·ft)@3000 193 g/km
Cayenne S E-Hybrid 2014- 2,995 cc (3.0 L; 182.8 cu in) V6 416 PS (306 kW; 410 hp)@5500, 590 N·m (440 lb·ft)@3000 79 g/km
Very different cars. The hybrid was rated I believe at 25 mpg. The e-hybrid is rated at 47 mpg.
The hybrid technology or concept is interesting, however it costs more than you will save in 4 years, and it can be beaten by diesel. The e-hybrid or plug in hybrid concept is far more effective simply because you can run the car all electric if you want. The hybrids invariably require the gasoline engine the majority of the time you operate them. The e-hybrid can literally see you drive 20,000 miles without turning over the gasoline engine if you want.