We took my wife's TDI on a trip from Aurora, IL to Troy, MI on the first cold snap and both mornings the B-10 partly restricted the flow through the fuel filter and diminished power for about 20 miles until it got warmed up. Unlike our CRDs, my wife's TDI has no fuel heater so I suspect that is why it took longer to heat up and run full power. On equally cold mornings since neither the CRD or the TDI has had a problem with gelling. They must have adjusted the blend. I try to buy from truck stops when I can so I get good season blended fuel instead of the small service stations.
As far as the birds and wind power goes, I have not seen or heard of any birds being killed by wind farms in the Midwest, Northeast, or Denmark. I have heard many stories about Charles Manson and his plans to dump LSD into the California water supply. If he stored his stash in steel drums, or glass jugs with steel caps, the LSD may be leaking into the water supply and effecting the birds causing them to chase the prop blades and come to their demise
Find the LSD stash dispose of it and problem solved
To get back to the gel issue and how it ties into wind power. Wind mills cleaning up the grid can keep you block heater working properly, keep the engine compartment warmer so our CRDs can start, warm the fuel and prevent a gel stall in the middle of the road.
Steve