We dump ours in a manure lagoon at a local dairy farm. Even with the methanol in it is fine for fertilizer when mixed with 1,000,000 gallons of manure.
Better yet would be to find a farm operating an anerobic digester.
Bob
The Biofuel Clinic LLC.
bob@biofuelclinic.com
Authorized BioPro Dealer
http://www.biofuelclinic.com/