Methanol is EXTREAMLY toxic even by skin absorption !!
Even a tiny amount of Methanol contamination of your food or drink can result in permanent blindness and brain damage. It is so poisonous I am very surprised you can buy it legally. I know Drag cars / bikes used to use it but I think that it is banned now. ( I was a reguar at Santa Pod back in the 1970s)
From your prices I think a 50/50 blend would be very near the same price as petrol but a lot more dangerous.