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To help interpret Vekke's graph:
If you need 7.5 hp (5.6 kW) at a particular speed, the best gear ratio is that which has the engine running about 1400 RPM at that speed.
If you need 15 hp (11.2 kW) at a particular speed, the best gear ratio is that which has the engine running about 2000 RPM at that speed.
If you need 60 hp (45 kW), you don't have a choice. You only get that much power at about 4600 RPM. But if you keep the gas pedal on the floor, and change gears to get 3300 RPM, the power drops slightly to about 56 hp and the specific fuel consumption improves from about 250 to 222 g/kWh. That's 13% better (more efficient) use of the fuel.
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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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