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My old Canyon would pull from 600 RPM, which was about 21 MPH in 5th gear. There was not much power, but it pulled smoothly enough to accelerate (slowly) from that speed on a level road. The ignition timing was right at TDC, or even 2 degrees after TDC at that RPM.
I once had a 3 inch trash pump with a single cylinder Wisconsin engine. That engine had magneto ignition with a impulse coupler. The impulse coupler winds up a spring until after TDC, then spins the magneto to generate a hot spark after TDC. That engine easily started on the first pull either cold or hot.
If I was experimenting with an engine to develop power at less than 1000 RPM, I would experiment with ignition timing set after TDC. I would not be surprised if 10, 20, or even 30 degrees after TDC would be the sweet spot at low RPM. You want the hot gas to expand doing work before the cold cylinder walls cool it down.
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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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