The Navy is soliciting bids for biodiesel the F-76 marine diesel and JP-5 shipboard jet fuel supply uses in the Inland/East/Gulf Coast bulk fuels tender. According to Biofuels Digest, bid submissions can be for 10%-50% biofuel blends and they must be cost competitive. “DLA will purchase the biofuel blends only if they are cost-competitive with their conventionally-derived counterparts. $27.2 million in US Department of Agriculture (USDA) Commodity Credit Corporation (CCC) funds, capped at 71 cents or less per neat biofuel gallon, are available to defray any additional costs that may exist for fuels derived from domestic feedstocks on a USDA-approved list.”
So, cost-competitive includes a subsidy. And the Navy apparently has a management program that will handle different blends which will have different heat values. Does that mean your high performance jet aircraft could have different fuel response characteristics each time you brought on fuel? That looks like the last place I would want to toy around with the PC biofuels program.