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Here's some numbers. I'm making wild guesses as to weights and drag because I'm too lazy to look up more accurate numbers, but it will give you an idea. Remember that the power available at that speed depends on the transmission gear ratios, so rated engine power will need to be higher.
Assume:
55 MPH
6% grade
3500 lbs with driver, fuel, dirt, and stuff
15 hp to hold 55 MPH on a level road
85% driveline efficiency
Then the power needed to climb the hill is:
3500 lbs X 0.06 grade X 55 MPH X 1.467 (convert to ft/sec) / 550 (ft-lbs/sec/hp) = 31 hp at the rear wheels.
Engine power needed is then (31 + 15) / 0.85 = 54 hp
Add 3 hp to run alternator, water pump, power steering pump = 57 hp.
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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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