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After many years of trying to find a replacement for max power to characterize the engine with a single value of torque that is more precise than power, I defined the Weighted average torque. But using it in the simulation did not confirm it as an equivalent (using that torque instead of the engine torque curve did not result in the same distance covered in the same time while using a single gear ratio on all rpm range).
Then I tried the empiric way and noticed there is an Equivalent constant engine torque that fulfills that condition as it can be seen in this video.