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Lasted edited by Andrew Munsey, updated on June 15, 2016 at 2:15 am.

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ECE R24 is one standard for measuring net horsepower. It is quite similar to the DIN 70020 standard, but the requirement for connecting an engine's fan during testing varies. ECE is seen as slightly more liberal than DIN, and ECE figures tend to be slightly higher than DIN. John Deere is one strong adherent to ECE testing.