Perhaps, living in NH, it's now getting warmer, and more summer like in temperatures, reducing your engine warm up time, and putting less soot in the DPF every time you start up on a cold motor. Take logs, run notes on ambient temperatures at engine start up time, and get back to us in 5 years. When it's cold out, you can't run biodiesel, it's gel point is too high, at 30 to 40F, it will clog your fuel filter, compared to regular diesel fuel at 7F. I can assure you, biodiesel does not help your DPF at all, or lengthen the miles between regens, it has a higher flash point than regular diesel fuel. High probability it is not all completely catalysed and has residual fatty acids still left in it that do your DPF no good.
If you really want to find out, try this: Run your fuel tank well into reserve, and fill up with 100% biodiesel in the fuel tank. Make the next 4 fillups biodiesel. Log all your regenerations, and routes driven when doing so. Top off with regular diesel, ie good old number D2, B0 fuel. Repeat exact same routes, for 4 tanks of fuel, exact same logs. Then you'll be able to share some educated observations.
It helps to substantiate your claims with blind testing, side by side, by labratory technicians with no interest in the products they are testing. You obviously have a green agenda and some sort of reason you want to promote biodiesel consumption, It's all in your name, Mr. Green Oxygen crew.
I just last week did a trip that was about 800 miles in two days, to go mine some turquoise mineral samples in Nevada. I took my AWD VW TDI Touareg on that trip, and set the cruise control to the legal limit 65mph the whole trip. Weather was a little high in humidity, about 40% the days I was driving. I went 485 miles between DPF regenerations on that trip. Bigger 3.0 liter diesel motor, lighter 5000 # SUV, a lot less load on the motor and working a lot less harder than a Canyon or Colorado. 1 quart of biodiesel added to the last previous fillup, I believe.