gas mileage Mechanical vs Vacuum Secondaries

LXguy, what it looks like on paper to you and how it actually runs are 2 different things.
'not talking about the chart above'
I've been running run of the mill holley street DP's for a long time, and compared to the vac secondary carbs, there really isn't a diff noticed at the pump, but the ET's sure are better with the DP's and 'my combo's' which have to be streetable since I drive primarily on the street/hwy's.

I was getting 15mpg with my 10.1 344sb .528 solid w/+5*, running 24*int/32*total 3.73 gear, 4 spd , ported X heads, w/weiand single plane-750 double pumper.

w/no vac advance and could of only added w/vac adv 6* more before it would clack upon hard xcelleration, so maybe there was another 2mph left...17mph?

the issue with pvcr's is app dependent, as in...if milage is your ultimate goal.