The state's chief minister M K Stalin said the 34 died after consuming liquor that was tainted with methanol, according to the Press Trust of India news agency.
Fucking idiots. It's very difficult to make enough methanol to be dangerous with a standard mash and distilling methods. Most of the time these fucking idiots are using stolen methanol from industrial sites to bump up their ABV and they make people super sick with it. Stop killing/hospitalizing your customers and you won't get caught.
this explains it a bit. The quick and dirty answer is that when you boil a mash, you are boiling a solution, not just 3 individual liquids (ignoring all the other stuff in there). It's similar to how adding salt to water lowers the freezing point and raises the boiling point.
Water is polar, while ethanol only has mild polarity. Methanol is more polar than ethanol, so it holds onto the water more. If you had a mixture of methanol and ethanol with no water, you'd probably get more methanol first, but the water changes things.