Diesel versus Petrol, which one is more expensive, where you are . .?

Question

can you possibly explain the reason technically or otherwise

was just reading ...>

In scientific terms, diesel produces about 40 megajoules of energy per litre, as opposed to about 35 for petrol. Diesel engines generate 10-20% lower CO2 emissions per mile than an equivalent petrol engine. In addition, diesel is cheaper to make and easier to store, being less prone to evaporation.

http://www.thisismoney.co.uk/news/article.html?in_article_id=442010&in_page_id=2

Answer 1

Diesel is more expensive than petrol (gasoline) where I live in the US (and in most or all of the western US).

I cannot explain why, other than the refineries in the US are producing less diesel and more petrol.  But, why they choose to do this, I do not know.   My opinion and belief is: there is some political reason behind the price disparity, and that there is no technical reason.

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Answer 2

From what I've seen in California, Arizona, Nevada, Utah, Colorado and Nebraska, the price of diesel is about 15 - 20% higher than ordinary petrol.  It would seem that both are priced evenly when you consider only the chemical potential energy and not the number of gallons.