I know that this has been discussed in the past, but after reading through all the posts I'm confused as to why you cannot simply distill nitromethane from the hobby fuel without having to add water to extract the methanol. I mean, there are many bees that say to distill out the methanol and nitromethane, leaving behind the oil lubricant, then add water to the nitro/methanol mix. The methanol will go into the aqueous layer and you can remove the nitro layer with a sep funnel.
Why do all that? If the bp of methanol is 64.55 and the bp of nitro is 101, then there is certainly enough difference between the boiling points (according to Zubrick) to perform a regular distillation. It seems like you can distill the methanol and the methanol/nitro azeotrope (which I believe boils at 65), but once the temp rises to 101 you can change receiving flasks and distill the nitro, leaving behind the oil lubricant. The bp of the lubricant is unknown, but I'm willing to bet that it boils well above 100, otherwise what good would it be acting as a lubricant anyway. So, in conclusion, I don't see any point of extracting the methanol with water, correct me if I'm wrong.