I think you will see the engine manufacturers embrace higher bio percentages as more bio plants come on-line and the distribution system develops. The refining capacity continues to be limited and in some markets there have been inconsistencies in the quality of the bio product. With the recent price increases in petro fuels, more money is flowing into bio production so we should see more, high quality fuel on a consistent basis. That should help establish a comfort level for engine manufacturers. We have a new bio plant going into production on the eastern shore of Maryland that I am hoping will be able to produce enough to supply stations near me. If that happens, my truck and two diesel VWs will be using bio. As far as the mix goes, a friend has been running B100 during the warm months in his Sprinter, 3 VWs and two Mercedes for nearly two years. He blends during the winter, but keeps the bio percentage pretty high. No problems so far. He does make most of his bio. Beautiful product and it costs him about 85 cents/gallon to produce.