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Ouch. There's now some independent analysis that says the Nissan Leaf wilts in the heat.

One of the less desired characteristics of biodiesel produced from natural and renewable substances is that it is more readily susceptible to oxidative degradation than petroleum diesel. Degradation of biodiesel leads to the formation of lower molecular weight acids, peroxides and gums that can result in unwanted changes in both the properties and performance of biodiesel. These impurities can result in injector fouling, filter plugging and excess engine deposits - all problems which have been e