Why is Diesel Fuel More Expensive Than Gasoline?
http://www.wisegeek.com/why-is-diesel-fuel-more-expensive-than-gasoline.htm
Diesel fuel, the kind of fuel commonly used in commercial trucks, has not always been more expensive than the standard gasoline used in passenger vehicles. On paper at least, diesel fuel is a less refined petroleum distillate than gasoline, so it should always be cheaper to produce than gasoline. The problem with diesel fuel prices has more to do with the laws of supply and demand for various petroleum products, not the actual cost of production.
A barrel of crude oil can be "cracked," or broken down into a number of different products, from home heating oil to gasoline to kerosene. Oil refiners can only process a fixed number of these products at one time, however, so they tend to choose the products in highest demand at the time. This generally means gasoline for passenger vehicles takes precedence over diesel fuel for commercial vehicles. When the supply of diesel fuel is low, the price naturally goes higher.
At some point in the year, oil refiners concentrate their efforts on another product similar to diesel fuel: home heating oil. At this point, usually just before winter, diesel fuel becomes more plentiful and the price usually drops. This trend doesn't always hold true, however, since a particularly cold winter can keep demand for home heating oil high and once again put diesel fuel production lower on the refiner's agenda.
http://www.wisegeek.com/why-is-diesel-fuel-more-expensive-than-gasoline.htm
Diesel fuel, the kind of fuel commonly used in commercial trucks, has not always been more expensive than the standard gasoline used in passenger vehicles. On paper at least, diesel fuel is a less refined petroleum distillate than gasoline, so it should always be cheaper to produce than gasoline. The problem with diesel fuel prices has more to do with the laws of supply and demand for various petroleum products, not the actual cost of production.
A barrel of crude oil can be "cracked," or broken down into a number of different products, from home heating oil to gasoline to kerosene. Oil refiners can only process a fixed number of these products at one time, however, so they tend to choose the products in highest demand at the time. This generally means gasoline for passenger vehicles takes precedence over diesel fuel for commercial vehicles. When the supply of diesel fuel is low, the price naturally goes higher.
At some point in the year, oil refiners concentrate their efforts on another product similar to diesel fuel: home heating oil. At this point, usually just before winter, diesel fuel becomes more plentiful and the price usually drops. This trend doesn't always hold true, however, since a particularly cold winter can keep demand for home heating oil high and once again put diesel fuel production lower on the refiner's agenda.