sub- 0.15
Let's say you did everything and ended up at Cd 0.12,then
0.12/ 0.31 = 0.387 ,or, you have 38.7% of the original drag.A 61.3% drag reduction.
At a 2-to-1 ratio,you might expect a 61.3/ 2 = 30.6% mpge improvement at a constant 55-mph.
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