Especially the new lacquers don't need much thinning. Earlier, to meet the VOC standards the manufacturers would make the lacquer without enough thinner (because more thinner added to the VOC). On the can, they'd tell you not to thin (because then they'd exceed the VOC), but the rep would wink at you and tell you to thin it a bit for better flow out.
If you're using one of the modern formulated lacquers try spraying it full strength on some scrap and see how it flows out. Thinning doesn't make the lacquer go any further because it all evaporates.
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