The XL1 is the lowest CdA of any "production car" - the frontal area is just 1.5 square meters (16.146 sq ft), and the Cd is 0.189, so the CdA is 0.2835 sq m (3.05 sq ft). The tandem seating is a big compromise, and the the staggered side by side allows the 5.5kWh battery pack to be located in front of the passenger; which reduces the frontal area vs a location under the seats.
The side by side seats are quite close together, and the passenger's seat is angled slightly to get it closer to the diver's seat; and the offset allows the shoulder room to be much better than otherwise.
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