Researcher Jon Gabrielsen says that "In the United States, with oil around $40/barrel of crude, just one alternative fuel remained cost-competitive, the analysis finds: compressed natural gas, or CNG." "I had to concede that despite the challenges to equip for CNG and the costs to upfit the vehicle, the savings are even larger, making it the lowest break-even proposition against diesel."
You can find his report here.
"Any time that one can fuel a commercial vehicle with CNG for at least fifty cents per DGE less than with diesel fuel then one will have at least a 3-year or shorter payback by having equipped for CNG instead of diesel."
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