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I've been thinking about a 1l Ecoboost for my 49 Ford. The cylinder deac makes them even more interesting, though I have my doubts as to the real world benefits and possible eventual repair costs (Honda have issues with their V6 system).
Downside is these engines are no fun to drive for economy. You can't use the usual BSFC approach, you really just need to drive as slowly as you can bare. You can't stay out of boost as you're already at peak boost at ~1200rpm.
I think a more sensible approach would be to use an electric supercharger, that could be deactivated when not needed. Possibly you could fit a bigger exhaust driven turbo that would allow for some off boost driving, but turbo lag is of course never fun.
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