I think its important to also talk about the media used to apply the product, as some will soak up the product more than other media.
So, in effect, the media that soaks up less product should help yield more vehicles per syringe.
The best method I have ever seen for applying this was some guy a few years ago when Opti-Guard/Coat first came out, was using a small, thick, and firm sponge that he inserted into a neoprene, etc., glove, and then wrapped a new blue paper Shop Towel over this tightly.
As you can imagine, the paper towel is thin, even in 2-3 layers, and will absorb just so much and stop absorbing, unlike any sponge that will keep on wicking up the product.
Also, you can actually see the darker blue paper towel now, that is holding your product, and determine how much you actually have left on there and adjust your application accordingly.
So I tried this application technique on my 3 vehicles, one of which is black, and saw no evidence of damage to the paintwork from using this, and did not take much Opti-xxxx to do the 3 vehicles. Did not measure, sorry. But I definitely did not have to wonder how much I needed to add to the paper towel, since I could easily see how wet or dry it was by the color of the blue towel.
Also liked the idea of a thick small rectangular sponge that was easy to control and could get the product in any space easily and smoothly.
The sponge I picked out to use for this is made my Tuffshine products and is an applicator sponge used for applying their clear coat tire dressing. Its a good size that fits easily into a medium or large neoprene glove as well..
Good luck with this !
Dan F