I burn it when I have time to make it. Tons of DIY info on the web. Bio makes up a large portion of the fuel market in Germany and MB has made cars ready to burn it since the late 70's from what I have read. MB rubber fuel line holds up to the methanol very well, and my 83 300d runs great on it at any mixture from 100% bio to 99% dino fuel. No modifications needed to run bio. Cost to make not counting time is about 60 cents/gallon.

Jim
83 300d 238,000