gas mileage Mechanical vs Vacuum Secondaries

yep ramcharger, and from the dp's Vs's I 've played with they are usually on the lean/small side, so I'm not really banking or putting too much significance on the pvr's that the other guy mentioned, they are open during low vac/power mode anyways with the vac too high at any real cruise speed to open them.

it's all in the foot.

btw...unless it's a special app/ or large cfm holley..the pri/sec r both 30cc pumps.

and know that the vac sec will open the secondaries if vac is high enough, given only as much as the slot/linkage will allow.