I could be looking at this the wrong way, but if you could disable all (or near all) vacuum devices on your engine including brakes etc, I would think you would get better MPG. I have read a little about some disabling the vacuum boost to their brakes so my idea might be ok.
Onto my idea...
Direct electric driven vacuum pump + large container to maintain vacuum and keep the electric motor need to a min. This is of course in a tightly sealed system with no leaks. Idea behind how it would inprove MPG would be the engine has to work less to suck in the air (non-turboed in my case).
Looking at
þÿ I will want to leave my vacuum sensor and EGR system minimum intact correct?
I do need to search more details about vacuum systems, but figured some feedback as to MPG increases is my desire.
Side note: When doing a few EOCs, I found the brakes are fine, but I don't notice anything in the diagram relating to the brakes. Power steering is the oppsite, pretty high geared so steering isn't very good while EOCing and probably will only EOC if no one is around and during the day time.
Side note #2: If a vacuum system is in good shape, could it be tested by hooking all of the intake lines to a "collector" and using a vacuum pump (to 5psi vacuum) and watch for it to loose vacuum?
Input always welcomed.