LarryJM wrote:
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
My 1996 7.3L F250 with an automatic tranny and 3.55 differential easily beats that. I regularly tow my travel trailer at 60 mph and record a consistent 14 mpg average, and it has done so since I bought it 19 years ago. Without a tow, I get 23 at 60 mph and 21 at 70. Perhaps the vans don't do as well.