A friend of mine from England told me a story from his town a couple of years ago. A large market had cases of vegetable oil on sale at a low price. But they were amazed at the demand for it. They were selling hundreds of cases per day.
Turns out that a 50/50 mix of regular diesel fuel and vegetable oil works quite well in the diesel cars over there. And without the road tax and various other taxes the vegetable oil was far cheaper than diesel fuel. One byproduct was that the cars smelled like french fries.
Diesel cars are far more popular in Europe, and the diesel engines of the past couple of years and fuel seem to be more advanced than what is sold over here. Much cleaner and more efficient.
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