http://www.grinningplanet.com/2005/04-12/diesel-vs-gasoline-article.htm
Hybrids...
Refinery Operations
http://www.eia.doe.gov/oiaf/servicerpt/table11.pdf
Truck Engines: Gas vs. Diesel
Not much about price rationale but:
It should be noted, however, that it takes about 25% more oil to make a gallon of diesel fuel than a gallon of gasoline, so we should really look at how a vehicle does on fuel efficiency in terms of "oil equivalents. "
Hybrids...
Refinery Operations

http://www.eia.doe.gov/oiaf/servicerpt/table11.pdf

Truck Engines: Gas vs. Diesel
Not much about price rationale but:
Choosing between a gas and diesel engine really comes down to what you'll do with the truck and where you live
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