This very issue came up on the Midnight Trucking Network this week. Biodiesel is what all the big rig drivers are talking about, for the reason that lubricity is there.
I think we're pretty much screwed as far as our trucks go. Pretty much, we're going to have to dose up on Stanadyne and use Bio.
I only tow 2-3 times a month tops, maybe 2000 total miles, and can't justify $35k or more for a new truck OR driving a dually to work every day. I'm planning on running my truck three more years, then will evaluate the purchase of something new that'll handle the new fuel better. Trying to get as much mileage as I can out of this truck and my '01 Chevy, then will part with both to get a new truck.
Hopefully this '91 will treat us right and give us 3 more years of good service so that we can afford a large downpayment on something new... or maybe we'll just get orders overseas at that point and won't need a vehicle at all for a few years...
Freight, I assume you're making 100% bio? Shouldn't take a whole lot per tank to get your lubricity up with the new ULSD, I'd think...