-13 mulchforkfuls will fill an 8 cubic foot wheelbarrow, 4 of which constitute roughly one yard.
-An 8' pickup will accomodate 2 cy of mulch (Don't try this with pea gravel!)
-All of the mathematical calculations related to mulch coverage fail to take into account planting density (The percentage of a given area which cannot be mulched because there are plants in the way).
-If the surface of the beds is rough and irregular, you can wind up 10% short of mulch even on small jobs (6-10 cy)
-Slipping the kid driving the front-end loader $5.00 makes sure that you're NEVER short!