Professor Alex got the following two series of values as runtimes for a sequence of benchmark runs: $102, 240, 334, 504$ and $105, 225, 380,510.$ Let the geometric mean of the first series be $g_1$ and that of the second series be $g_2.$ Instead of taking the geometric mean uplift $g_u$ as $g_1/g_2,$ Professor Alex took the geometric mean of the ratios of the two series: $102/105, 240/225, 334/380$ and $504/510.$ The percentage deviation of the value he got from $g_u$ is _____ (Rounded to one decimal point)