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

Does DFI permit higher overall compression ratios for a given octane
rating?  That would improve BSFC.

SD

I do not know the answer to that question. I am not an engineer or
fuels system scientist. I'm paraphrasing ecoboost from Ford
information. I just work at the product development center in the
mainenance dept.

C. Smith

I e-mailed Mazda Canada a couple of weeks ago to ask about the fuel
requirement of the Skyactiv engines. I found the answer in the Drive section
of the paper. Europe-14:1 with premium fuel, USA-13:1 and I believe premium
fuel. Canada-12:1 with regular fuel as market research says Canadians are
reluctant to buy premium. I did some math and the fuel costs would be less
with the better MPG at 14:1.

Dale Davies