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Wing efficiency doesn't really enter into this.
The bottom line is, when lift is produced, drag is also produced. More lift > more drag.
Less lift > less drag.
*Whatever* angle of attack or airfoil design doesn't matter; the above holds true... unless you want to get funky and talk about undesireable situations like stalls and whatnot.
Keep in mind that "lift" can be in an up or down vector, depending on. For cars we tend to want "down".
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