> I still can't work out where they are 'suddenly' finding power and economy 
> from. Eg 5 series BMW 55 mpg average. That same model car was getting not 
> much more than half that only 5 years ago and was slower too.

The cynic in me wonders if they're just very highly optimised to work
with the standard economy test... certainly there are plenty of cars
around with very good headline figures but which are much less
economical in the real world. OK perhaps if you sit at 70mph, never
accelerate or decelerate, for hundreds of miles at a time, but no
matter how careful you are that's rarely possible.

It still takes about the same energy to move a car at 70 as it always
has, but releasing that energy (i.e. the volumetric efficiency of the
engine) has certainly improved.

Neil

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