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I don’t think you count the area under the car, just the tyres frontal.
Area of 2 205 width tyres lowered by 25mm.
205 x 25 = 5125 mm sq x2 = 10250 mm sq
20.5 x 2.5 = 51.25 cm sq x 2 = 102.5 cm sq
0.205 x 0.025 = 0.005125 m sq x 2 = 0.01025 m sq
Total frontal area is 1.93m sq
% of original frontal area being removed:
0.01025m sq / 1.93m sq = 0.00531 * 100 = 0.531%
I’m not sure if that’s correct, but I suppose there are other advantages to lowering (less air under the car, smaller wheel arch gaps).
If you feel not having the pass mirror is a safety issue then put it back on, it's just not worth the risk of an accident.
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