Vacuum Advance Solution?

What do you guys think of this idea?

My big block has an MSD 6AL box and MSD ProBillet distributor, but no vacuum advance. I noticed you can buy an MSD timing adjuster that allows you to dial in +/- 15 degrees of timing. So, I can install that, and when crusing, dial in 10 to 15 degrees more advance to have the same effect of vacuum advance, which is better milage and less carbon deposits in the cylinders? When its time to put the hammer down, just dial the knob back to zero, and then I will have my 36 degrees total timing.
Author: cudabob496