Originally Posted by ap72
idle vacuum doesn't have a damn thing to do with PV selection. Drive your car on the highway at your normal cruising speed on a level road, what is your vacuum at that moment? Now subtract 3 or 4 and you'll have a good number to start with. Going smaller will slightly help mpg's going higher will slightly help power.
lol'n guess you've never had a nasty engine that idles real ruff