funkyoldcortina wrote:
On 20/12/11 10:39, Dave Plowman (News) wrote:
In ,
wrote:
http://www.bbc.co.uk/news/uk-england-london-16244634


"It was later established that the bus had run out of diesel."

Just like a Pious, then. Half decent fuel consumption in start stop town
traffic, but far worse than a conventional vehicle at near steady speed
motorway, etc, work.


That's not true for the Prius. You still get better mpg than a
conventional petrol car on motorway trips, as once you're up to speed
you can ease off the pedal and the electric motor does most of the work
to keep you at-speed, requiring much lower power output from the engine.


Er no, probably it doesn't. That depends on where the peak efficiency of
that engine is: at 50mph this might indeed be true at 70 mph it probably
wont be.


You are second guessing the 'crusing power' of that car and you then add
a small amount of storage in the hope that stop-starting the engine to
charge is relatively efficient compared with having it on all the time,
and that you have accurately gauged what its peak continuous power
requiremtents will be.



The engine is Atkinson cycle too, so beats a regular petrol engine at
low RPM.

But doesn't at higher RPM etc. Not will it beat a good diesel in either
case.

Unlikely to beat a modern diesel's MPG figures on these kinds of trips
though.


Exactly.

Sadly the Prius is an Ok ish town car but its not a car for a lot of
motorway use. A good modern diesel in a light bodyshell is a lot better.

And a full BEV is better in town..