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What is the distance and elevation change on your commute? I see that the constant is exactly the same in both cases, 24.7. This implies that the elevation change is not affecting your mileage.
You could run another set of correlations by lumping all data together, with a to/from work variable. I use 1 for to work, and 0 for from work. The resulting coefficient is a direct measure of the effect of direction / elevation change / how tired you are / traffic variables / other confounders.
I regularly drive a route of about 60 miles with net elevation change of 800 feet. In the summer, I normally get 30 to 35 MPG uphill and 35 to 42 MPG downhill. The exact MPG depends on wind and temperature.
I also drive a 4 mile stretch of winding gravel road with 35 foot total elevation change. In the summer, I average about 38 MPG downhill and about 30 MPG uphill.
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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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