We only put one pull on each drawer and Door. Originally we were going to use the 3 3/4 pulls but when we had the cabinets installed and held up the pull to the cabinets they looked too small to us so we changed to the 6 inch pulls.

We liked that look and the single pull on each item gave it a nice uniform look.

I just asked this same question today to my cabinet guy or KD. We are using 3 3/4 inch pulls on all drawers and long doors and knobs on the doors. He recommended anything over 24" use two pulls. I have 4 drawers which are 27" or bigger. I guess you can buy some extra ( you need some extras anyway) and hold them up and see what you like. Good Luck with your project.

My KD recommended:
One pull on cabinets
Two pulls on cabinets >= 30" wide

Here are some pics:

18" drawer on top of trash pullout on the right (our smallest drawer), 33" drawers on left:

24" drawers:

...and...

27" drawers on left, 31.5" drawer under the ovens:

30" drawers (above & below warming drawer):

36" drawers:

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If this helps:

Pull spacing on 36" Drawer

Beuhl - thanks so much for posting this extraordinarily useful information about how many and where to place pulls especially the measurements.