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It all depends on the vehicle and how you use it. Aeromods aren't as effective the slower you travel. Weight reduction is not that effective if you're highway cruising. A grill block on a car with a huge grill will do wonders, where some cars have an almost closed off grill or now have automatic shutters. A taller 5th gear will do very little for someone who uses P&G constantly, but will work quite well for someone who cruises.
Sorry, what you ask is not possible with any real accuracy. You need to figure out what mods will work best for you, your vehicle, and your commute.
If you explain these things to us we'd be happy to help though.
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