It's not that simple.
Your highway mileage is mostly the result of air drag, followed by driving technique (DWL and DWB). Good mileage comes from driving at a steady, economical speed and not using the brakes.
Your city mileage is mostly the result of road conditions and driving technique. Good mileage comes from keeping moving without using the brakes. If you can match pulses and glides to the inevitable speed variations, then it is possible to get better mileage in the city than on the highway.
If my only driving was back and forth into town (11 miles round trip), I would be averaging about 45 MPG in the summer. That trip has a top speed of 40 to 45 MPH and two stop signs.
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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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