In order to use the efficiency of a car engine in an optimal way, a maximum engine speed of 2500 RPM for shifting is recommended for gas engines.
A car's fuel efficiency is determined by how well it converts the energy in its fuel into kinetic energy for movement.
Most of the time, it's advisable to maintain a speed below 2500 rpm for economic reasons.
Range of 2000-2500 rpm is the best for shifting as
1) It is the most favorable range for the engine due to economic reasons.
2) It saves fuel.
3) It also keeps the engine heavy.
After this range, the economy usually declines.
Even though moving gears doesn't significantly affect engine life due to technological developments, but shifting for gas engines is recommended at 2000-2500 rpm.
Hence, 2500 rpm is the maximum engine speed recommended for gas engines for shifting.
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