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If Ford spec'd 5W20, then 0W20 should work just fine. The 0W rating is cold viscosity, the 20 rating is hot viscosity. She will have less drag with the engine cold, same drag with the engine hot. You do not want to reduce the hot viscosity - that's what keeps the cam lobes from getting destroyed.
If her driving is in the 40 MPH range, I'd check the AT torque converter lockup speed. The most economical speed is the lowest speed where the torque converter stays locked up.
Study up on DWL and DWB. Those will do more for mileage than aero improvements.
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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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