"Paul D Smith" wrote in message
...

Of course the greeney in me has to point out that the diesel engine is
clearly incapable of moving the bus on its own which implies it must be
smaller and use less diesel than a conventional diesel bus, so it is in
fact green.

There is insufficient data to draw that conclusion.
A normal bus will drive using lots of diesel then stop using little diesel,
repeat.
The "green" bus will drive using battery and run generator using medium
amount of diesel.

Unless you know what the stop start ratio is and how much it runs the
generator you can't know its green.

It the prius problem, you can run a fully charged prius for a few miles and
claim its green, if you run the same prius for a hundred miles it uses more
fuel than a medium diesel car and it isn't green at all.