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Driven in my traffic scenario and considering yours is a manual, I would expect about the same spread as the difference in highway mileage between my 2011 @38 and your ecoboost @ 44, with a slight bump for the manual in your car.
My guess if the 1.0 was mine would be around 52-55 MPG average compared to mine at 46 MPG. I never used engine off coasting and would advise you not to use it, with the ultra high speeds your turbo encounters (close to 150k RPM?).
If you decide to ignore that advice then use the best synthetic oil you can buy, but you may encounter a warranty rejection due to shutting the engine off when moving as being not standard operational parameters.
regards
mech
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