Higher cost of diesel fuel due to maritime usage?

I don't see how the cost of ultra low sulphur diesel will not go up after Jan 1st. There is only a limited amount of processing capacity to manufacture ULSD and with maritime shipping mandating either scrubbers to be installed on ocean going ships (few of which actually have been retrofitted) of ULSD to be used a ship fuel there likely will be an increase in demand, reduced supply and therefore the price of diesel fuels for all vehicles will increase. The million dollar question is by how much? I have read increases ranging from 5% to 35%. So who knows, only time will tell.