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This may help
I have been checking out bike aerodynamics a lot this year. Here are some of my findings. Your position is most important. I use aero bars but am not down on them during certain parts of my commute.
While on aero bars, a h2o bottle mounted between your forearms can actually lower resistance. Otherwise try mounting a bottle horizontally on your top tube.
If you carry stuff, a backpack low on your back is better than panniers. A helmet is more aero than your head. No gloves are more aero than with gloves.
You could make disc covers out of coroplast, like I did for racing and get a deep section front wheel.
Wear tight clothes and shave your legs(yes it's been proven faster--almost a minute in 40k).
All of this together, on a 20 mile commute may save you 2-3 minutes. If you catch the lights green.
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