We love getting your questions, by email or on the blog. Dan writes: How much would a drive unit sized for a compact car cost? I’m [also] curious if there is a difference in the way the car drives? NRG Dynamix isn’t ready to share list price at this time. But the fuel savings for a taxi running one shift in New York over two years would be enough to pay for the whole car – NRG Drive hydraulic Drop ‘N Hybrid and all. As...

The biggest gains in fuel economy and emissions reductions will come when we remove the mechanical link between the engine and wheels. De-coupling the engine load from the road load allows the engine to run continually at or near maximum efficiency. A hydraulic hybrid does that, and offers more potential for greater fuel efficiency gains and emission reductions right now – more than electric hybrids, full electrics, and alternative fuels....