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There isn't any difference between EOC and DFCO in terms of fuel use. Both methods stop fuel from being injected into the engine. In EOC, the engine is stopped, so it's not turning anymore. In DFCO, the engine is still being turned because it's still engaged by the transmission, yet no fuel is being injected. This is why downshifting slows the car down. If it were injecting fuel then it would produce power rather than absorb it.
The advantage of EOC is that it doesn't bleed speed by turning the engine, so you can coast at a higher speed up until the point you have to slow down or stop. With DFCO, the vehicle slows down sooner because it's wasting energy turning the engine.
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