Stop in for a cup of coffee
I'm going to make lunch!
Reading up on how to tune Holley for MPG
IMO when dealing with the main system its best to first tune for power. Go to the drag strip and jet for best mph. (or a chassis dyno)
[Of course the best approach is to tune the low speed system, then WOT in top gear - but I dont know if you want to go there. Many hours..]
Then once the you know the primary main jets for best power under max load, see if its OK any leaner for interstate cruise. If it will go leaner for high speed cruising, then make up of the difference in the power valve channel restrictors. Verify at the track.
This guy was on the right path.
Am I running on my primary jets!
Ignore all the insanity later that you "can't " change mpg by changing jets...capped off by stuffing a rag in secondaries...:realcrazy: