Using methanol as auxiliary fuel (and associated questions)

[rfinkle2]

In the not so distant future, I plan on using the HFS-3 or HFS-4 for direct runner injection on my Mazdaspeed3 for many reasons, not the least of which is that there are no aftermarket injectors that are designed to keep up with increased fueling demands after modification.

Having experimented a bit and seeing the results of some logging, the idea that placing the nozzle as close to the combustion chamber allows for the most available combustible mixture has me wondering why in a more nuts and bolts way.

My questions is geared toward the overall idea of a closed system and what physical properties lend to the idea that if using methanol as an auxiliary fuel, it is best to inject as close to the throttle body as possible...

Ok, truth is, I'm not smart enough to know why this is a phenomenon chemically, but have seen recommendations from various reputable sources as well as logged evidence and could use some smartz.