According to Technology Review dot com and Kevin Bullis:
The military and GE have made strides toward a practical detonation engine.
Fossil fuels will be needed for some time, because they are less expensive and higher in energy density than alternatives. Advanced engine designs offer some of the best options for using them more efficiently.
A new kind of engine under development, called a detonation engine, could save the military hundreds of millions of dollars in fuel costs every year. The technology, which military researchers are working on together with scientists at GE and other companies, could reduce fuel consumption at power plants, in ships, and on airplanes by as much as 25 percent.
THAT MEANS The Navy alone estimates that retrofitting its ships with the technology would reduce annual fuel costs and potentially TAXES by $300 to $400 million.
On November 23, 2012 Source and FOR THE ENTIRE STORY: Technology Review
Thanks and ET List!