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CTE (Coefficient of Themal Expansion) is a ratio of change in volume per change in degrees. As with all equations, you need to be careful of the units. It looks like your values Jack are ppm/°F. Say you have a 12" brass section. 12"/1 million = 0.000012". CTE for brass 12.6 * 0.000012 = 0.00015"/°F expansion (less than 4 microns). Now say there in Montana your summertime high peaks at 85°, daytime in the winter is 10°. 85 - 10 = 75°. 75 * 0.00015" = ~0.011", just under 1/64". When you compare a CTE of 12.6 vs 11.0, the difference is minimal.
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