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If you're only driving 8 miles one way you probably aren't even getting out of closed loop mode which is where the car runs rich until it's at temp. It does that to warm up and get everything situated for driving, there's really nothing you can do about it besides getting a block heater to have the oil warm right from the start. I'm assuming 8 miles is probably city or slower speed roads in which case maybe you could get a bike/motorcycle/scooter to commute to work. Also if it's lower speed roads and short trips, your aero mods won't do much. Under 45mph you don't get that much of a return. Also try shifting at 2 or 2.25k instead of 2.5. I used to have a metro that if you shifted at 2k it got much better than 2.5k. Trying to get better mpg's can be frustrating especially when you don;t see the results that you want, but change some things and see what happens. Or change the vehicle, but i think 33-40mpg is pretty good regardless.
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