At what speed it's better to switch Lifan Smily gears

According to the manufacturer's recommendations, Lifan Smiley needs to switch gear at these speeds:

• From the 1st to the 2nd, at 25 km/h.
• 2nd to 3rd at 40 miles an hour.
• From 3 to 4, 60 miles an hour.
• From 4th to 5th, 90 mph.

After you have run-in for the most economical fuel consumption, you can switch gear using another diagram:

• From the 1st to the 2nd, at 20 km/h.
• 2nd to 3rd, at 35 miles an hour.
• From third to fourth-at 50 km/h.
• From 4th to 5th, 100 mph.