Dima, Glad you found my tips helpful.
1. Optimizing your A/F ratios will definitely work particularly at the lower end of the RPM range where the best FE is found. If you have the ability to analyze the A/F ratio and reprogram your FI moto that would work very well.
2. Correct, most the FE gains are there as you run over 32psi.
3. here is the link to my aerotrunk project
https://www.ninjette.org/forums/showthread.php?t=153413
I'm running a much longer windscreen than in the pictures. If you are willing to install taller gearing you will see some big gains. Of course it will decrease your acceleration ppotential.
4. Yes! I don't know of any digital mpg gauge for motos like the automobile versions ( Scangauge or Ultragauge). You could use a vacuum gauge but really it's all about staying at the lower end of your moto's torque curve and riding in the tallest gear it can handle without lugging.