Where did you read / hear about the GM altenative fuels study? Are they talking about a straight corn oil & Methanol mix, simply "thinning" the oil? Or (more likely) is there a chemical process involved? If so, it's probably biodiesel or a close cousin. I believe it would be possible to make biodiesel out of corn oil, using the methanol in the catalyst. Most biodiesel in the US is made using soy oil (virgin or recycled), but corn oil should be possible.
If you have any sources or links, please post. It would be great to find out about a manufacturer-approved biofuel.
Those GM links seem to be for gas-engined pickups that will burn corn-based ethanol directly - 85% ethanol/15% gasoline; E85. No mention of biodiesel. You and I talked at the Northeast Gettogether in September. I too am wondering who's been running biodiesel in the Duramax. Sooner or later we will find out. Hope all's going well.
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