From my perspective, plug-in vehicles (including Chev's Volt) are DOA. You are effectively always tethered to your home by a distance which is half of whatever the cars actual range. IOW, in a vehicle with a 100 mile range, you can only travel 40-50 miles from your home. Not very practical.
It runs on Diesel/bio diesel, But those turbines in other applications can run on any liquid fuel, as well as natural gas, waste gases, methene..etc
but for now just diesel but with much better MPG then a normal engine
That's incorrect, the good part to the series hybrid is you are not limited by the battery charge. After the batteries deplete to predetermined level the ICE (or turbine in this case) kick in to provide charge to the batteries and to run the electric motor.
There are some good arguments that can be had about battery life, and drain on the power grid, but I like this design as a good stepping stone to alternative power for vehicles.
According to the Capstone website, they can run on a variety of fuels
Low or High Pressure Natural Gas
Biogas (landfill, wastewater treatment centers, anaerobic)
Flare gas
Diesel
Propane
Kerosene