This is entirely true. The new TDI gets a tax credit or something for being a super efficient vehicle(?), but the increased gas mileage never covers the 1$ more for diesel(unless someone fabricates crises that truckers refuse to buy into then gas and diesel are the same.
The reason for this is oil companies don't want to swing all towards diesel because then their gasoline is worthless(sort of). The reason they avoid the swing is you can't just produce Diesel its a byproduct of gasoline(so is kerosene). The oil companies have a strong desire to keep the market perfectly balanced to maximize profit.
<edit> If gas prices go up to say 4 a gallon like they were the numbers come out closer. But it's never under, except when they jack up gas and freeze diesel in said "crises."
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