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Sorry
Don't want to discourage you but aero mods at 12 mph over a 3k one way commute will be zero, except in a strong headwind. I have never seen published anywhere that aero mods on a bike even matter below 13 mph.
Aero mods will make your bike heavier which is only beneficial downhill.
If you want to make your commute faster or easier check into a 350 watt electric motor.
I pour over bicycle wind tunnel data because I race, so I do know of what I speak. I just don't want you to waste your time and money.
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