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I do not have manufacturing cost figures. I do have common sense however.
An I4 is a much simpler engine. A lot less parts, particularly the expensive parts such as pistons and fuel injectors. Much less labor involved in assembly.
Given similar production numbers, there is no way the 4 cylinder can't be substantially cheaper to build.
Making a part slightly larger does not greatly increase its cost. Adding to the number of parts does.
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