Carb. Mechanical or vacuum secondaries?

Ricks70Duster340 said

And frequently using the secondaries is my point exactly regarding fuel economy with the DP.

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If you are putting your foot into the secondaries all the time why are you concerned with fuel economy?

It takes .45 pounds of fuel per horsepower per hour.

So the more power you make, the more fuel you will burn. It’s simple math.