Carburetor does not have DFCO (except for a couple computer-controlled models from the end of the carburetor era). At higher RPM more air is moved and more fuel is sucked in. With a carburetor, neutral coasting is always better.
How about heavy throttle with a carburetor and a manual transmission? I imagine that the accelerator pump, squirting like a hose, has got to be pretty wasteful...probably better to accept higher RPM and pumping loss than to squirt at every shift.
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