Carb. Mechanical or vacuum secondaries?

Ricks70Duster340 said
Not putting DP's in the race only category at all, but common sense dictates the frequent use of the secondaries on a DP WILL reduce economy. The VS carb is an excellent choice for a daily driver.

DP only uses more gas if you floor it. Driving daily without flooring it, it won't use any more gas but I won't argue it :)