I love when dragon ball z comes up in threads awesome!!!
If Nissan starts to go for more fuel economy with the future z's I could see it hurting them more then anything. Traditionally every time they did a model change so did the HP. Every time the new z had more power and has "according to Nissan" been faster then the previous one. So if anything they should just keep the z on course and stay away from the fuel economy turbo bs IMO.