Vacuum pump

Help me understand why you're doing it. From your post it's because other people are telling you to do it but you don't have problems. Is that right?
I am not having any problems at this time. But in the long term People that have much more experience with alcohol as a fuel than I have are highly recommending that I install one. They say that less maintenance on the engine and less frequent oil changes will be needed. Also if it frees up some hp that would be a plus. This is why I'm asking for information from people familiar with this subject.