Mooney unveils new Diesel powered plane

If only it was that easy to make a new airplane. :)

If only it was that easy to produce a new airplane. :)

Well, I guess if they're aiming at billionaires exclusively, to purchase new Mooneys, they're going to sell more than a few!
Besides, becoming a billionaire today is as easy as A-B-C. Millionaires are just so passe, they're everywhere in todays world! [;-)

JetA fuel would work in it too.

JET-A is available at many airports.

Change is only needed when you have a design that has been superseded by technology, materials, or research showing that the design has limitations or flaws.
Vast amounts of 1940's aeronautical design features have been proven to be ideal and don't need to be changed.
They were produced at a time of some of the greatest amount of dedicated aeronautical research, with more funding than has ever been applied since - all driven by War and the need for superior aeronautical designs.
The only thing that has really changed since the 1940's is computerisation making calculations much faster. All the same calculations we can do today, were done in the 1940's, it was just done longhand on paper, using some very sharp brains of a lot of smart people. The laws of physics and aerodynamics have never changed.
One of the things to avoid, that creates additional cost, is change ordered purely because of aesthetics - and not because there are proven engineering principles, or new technology, in the new design, that make it superior.
GM wasted billions on many good prototypes in the 1960's and 1970's and 1980's, purely because the GM design dept ruled supreme and would not let any idea past them, unless they could "style" it to suit what they believed was a superior look that encouraged sales.
After you examine some of the GM styling aberrations that they produced - in the 1970's in particular - it kind of makes you wonder what they were smoking.
In many corporations, there is always a war on between engineers, stylists, and the marketing people. Each wants to be dominant. It is far better for these 3 depts to work together, rather than compete.