Tesla tested and basically designed the truck in the wind tunnel to optimize whatever could be done while having flat panels with hard edges. It would be weird if it were less than optimal within those constraints.
If Musk aims at getting it down to 0.30 you can bet the 0.48 of the model is high rather than low.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
 lifetime FE over 0.2 Gigameter or 0.13 Megamile.

For confirmation go to people just like you.
For education go to people unlike yourself.
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