May be one of the reason. I also after change cams have engine oil burnout issue despite has already fully overhauled the engine - at no common oil burnout symptom like usual (smoky exhaust, sludgy plug tip... signs of blown piston ring/scratched cylinder wall/leaky valve or plug seal).
But I did notice the engine oil decrease faster if I peak out RPM more often and gone long top speed runs, but level maintains if I drive in 'nerd' mode. The decrease can be noticed immediately after a night's hard drive. Sometimes I suspect the engine oil with little evaporation or tiny droplets sent flying under the head cover by moving parts, being sucked out from the cylinder head through the head cover breather ports (into intake plenum at higher rev & hotter condition) as logically, longer duration cams with higher valve lifts made higher vacuum flow into the combustion chamber at intake stroke along the peak powerband. Just my guess, but I rule out engine's leaking out the oil anywhere physically and visible. I would have noticed where it went.
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