I was just up near Medford, Oregon..I saw an outlet for biogradable diesel..(Wonder it's octane.) I was on bike the whole time, so had little interest to stop..But, noticed it's price was $3.99 a gallon..
Yes, there are alternatives..For a long time now, I have been receiving an electronic newsletter from "Brainfood'.One of their presentations dealt with petroleum supply..Unfortunately, much of the oil rich countries have peaked and production will soon be falling..Whenever, alternatives are available, I feel sure it will not be until significantly after the downside of petroleum's peak.