Tuning idle for fuel economy with lean mixture

[clochard68]

I try my luck again here in the economy forum as well, as I didn't get any response in the main forum:

Recently I saw this David Vizard video, where he talks about setting your idle up for minimum fuel consumption (starts at around 25:00):

He talks about air-fuel-ratios at around 15:1 at idle...
Has anyone done his method before? (air/fuel mixture for MINIMUM vacuum, then adjusting timing for MAXIMUM vacuum --> results in lean mixture with high timing)

Any thoughts on that method? Has anyone tried it? Does it affect general fuel consumption noticeably?

 

[DON]

Not me, I have an O2 meter
Sorry

 

[clochard68]

An O2 meter wouldn't hurt while tuning.

What air fuel ratio are you running at idle, higher than 15:1?

 

[DON]

I run closer to 13/14. It’s idles a little better richer. If I remember right, I set the timing first, then adjusted the carbs. Please note, this is not on an i6. I am building a six but haven’t got this far. It will have bungs put in the exhaust