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Hot air would reduce manifold vacuum for the same amount of power produced. Any restriction to incoming air would be the same as an equal restriction due to a throttle plate restriction.
Blocking the radiator so the coolant exiting the radiator was closer to the same temperature as summertime would also help. The wintertime coolant exit (from the radiator) temperatures can be as much as 100 degrees colder than summertime which causes greater losses in combustion chamber heat transfer to the cylinder walls.
In extreme climates with temps well below 0 F some hypermilers can adequately cool the engine with the heater core alone, while getting some decent heat in the cabin.
regards
Mech
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