2015 Nissan Z may be lighter, leaner

cossie1600

Unfortunately the industry/majority doesn't agree with you. Everything is going to lighter, smaller and more efficient.

From the racing front, F1 is going to <2.5L V6 I think in 2013. LeMans had been running the green program for a few years now with the hybrids and diesels. NASCAR went to EFI and unleaded finally. Indycar is doing turbos once again.

On street cars, cars are becoming lighter, faster even though it is using less gas and putting out a smaller carbon footprint. Just look at what BMW is doing with their 328, Ford with their EcoBoost engines, Toyota with their hybrids. They put out the same power as their predecessor without burning all the extra fuel while lowering their weight, resulting in a faster car.