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At that weight, you don't nearly need 1.8L of displacement, so the superfluous displacement is a burden in regard to FE.
It's there only to make a superfluous requirement happen : the acceleration.
It could work, with complex and expensive cylinder deactivation etc. , but it wouldn't be my choice of engine when building a 100 mpg car ...
Design claims quickly fade away on the way to production.
When a design has a target that is clearly not FE-related, I expect the mpg claim to vaporize .
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Strayed to the Dark Diesel Side
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