The Miller cycle will improve part-load BSFC only. The cycle works by
extending the intake stroke so that a large portion of the intake charge is
pushed back into the intake manifold during part load operation. Thus, the
engine's intake charge is reduced without incurring the losses of a throttle
plate. I guess one could extend the concept and run the extended intake
stroke at full load, thus reducing the compression ratio while maintaining
the expansion ratio. This can also have BSFC benefits but at the expense of
lower power density for the engine.

Jon Lauter

I noticed the smaller Mazda SC miller cycle engine only improved the city mileage 
by about 2 or 3 MPG while the highway MPG was unchanged over a larger
(2.3 verses 2.6L) non miller cycle NA V6.

Paul Lamar
 
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