It's more of an anything that's not petrol sensor, it's reading the ratio of petrol not ethanol. So if you get e85 then add 5% water it should read as e90, as demonstrated at the sau/wolf e85 tech night last year. As long as methanol mixes with petrol and doesn't separate i don't see an issue. If you're using this for water/meth injection then it won't work as the sensor can't differentiate the two. You should probably look into the effects methanol has on certain metals and decide if the sensor will cope.