Current thoughts are to keep your tanks full, filling when you have room,
cost averaging downward.

I was forced to buy a few loads this summer at the highest prices. As
prices drifted down, I kept waiting, letting our tanks get pretty empty.

We have storage for 35,000 gallons. A semi load is 8500 gallons, but I can
split the load between products depending on the truck. You can do the
math, but the load I got yesterday cost just over $23k. When we're busy we
use a load of diesel fuel every 2-3 weeks, but gasoline is much slower,
about a load per month spit between 89NL and 89+lead.

One more load was a physical cap. Our gas tanks are full, diesel 3/4.

Our LP tank is 30,000 gallons and a semi load of LP is about 9500 gallons.
Main use of LP is for drying corn, drying potatoes after washing, and
heating buildings. Thankfully we didn't plant much corn, so I don't have to
worry about filling that tank every 7-10 days during harvest.

You've got a great question about the % of each type of fuel consumed. I
hope somebody finds that answer it would be very interesting.
Jim