According to the Manual of Style, "the number of decimal places should be consistent within a list or context (The response rates were 41.0 and 47.4 percent, respectively, not 41 and 47.4 percent)."  Your addition of the tenths place on the metric conversion directly contradicts the guidelines in the MOS. There is no need to have the tenths place if the U.S. system is rounded to the nearest whole number.