valhalla360 wrote:
As someone else said, the math doesn't work. Something else was going on. You are showing upwards of a 30% loss in efficency with only 20% biodiesel.
I agree and furthermore if the OP is getting 12.8 towing then he has the one in a million 7.3L out there since to break 11 to 11.5 is an exception rather than normal for a 7.3L towing. A real issue with the 7.3L platforms is getting a good fill up because of the way the tanks are vented. From first shut off I can get almost 4.5 gal more in my tank before it is totally full and all the air and foam is out.
Larry