Sorry to beat this horse. To clarify the engineering goals of the Eco boost
concept. DFI isn't there to increase mileage. Its purpose is to reduce
emissions below government mandates, earning greenie points with regulators
and the tree hugger market. It does that very well. It does NOT contribute
significantly to BSFC. The BOOST component of the system provides some
degree of on demand horsepower, while limiting the cruise combustion volume.
If you drive a conservative profile, you will see better mileage, but HP is
there when needed. HP is still not free, and there are no magic bullets of
physics, thermodynamics or chemistry. You will find that Paul is generally
correct, that BSFC for a given HP demand profile is not markedly improved,
while structures are lighter, more aerodynamic and the engines are using
simply more versatile and intelligent application of technologies we already
know and love.

Disclosure, I work for Ford.

Secret. look for a 5 cylinder something in the future.

C. Smith