This study aims at investigating the effect of lubricant flowrate on load-dependent power losses, targeting gear contact conditions typically found in aerospace and electric vehicle drivetrain applications. Two experimental methodologies are employed to quantify the influence of lubricant flowrate: (i) a generalized elliptical contact of a two-disc tribometer configured with separate in-line torquemeters and a digital flowmeter, and (ii) a modified ISO-standard four-square test machine to measure the effect of flowrate on gear contact efficiency. These measurements indicate that reducing jet lubrication volume influences the traction performance of high-pressure contacts, the degree of which is most heavily impacted by surface roughness through asperity contact.