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I think that 30 MPG with a gas engine is not only realistic, but conservative. Make a hinged aero topper with some sort of fabric sides. The long box will allow the top to taper way down.
For the interior layout, google "teardrop trailer". Those trailers have solutions for a similar shape. I would put a piece of plywood over the wheel wells with a mattress on top. The space under the plywood would be storage plus a slide out kitchen. With careful design, the result would have room for two.
Use the space underneath and around the frame for more storage and a belly pan.
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06 Canyon: The vacuum gauge plus wheel covers helped increase summer 2015 mileage to 38.5 MPG, while summer 2016 mileage was 38.6 MPG without the wheel covers. Drove 33,021 miles 2016-2018 at 35.00 MPG.
22 Maverick: Summer 2022 burned 62.74 gallons in 3145.1 miles for 50.1 MPG. Winter 2023-2024 - 2416.7 miles, 58.66 gallons for 41 MPG.
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