I once owned a MF 533 (2007 version of the 135). It had a Perkins NA 202 CI 3 cylinder, long stroke engine derated to 45 PTO HP for use in the single reduction 533. It was a torque monster and used very little fuel.
The same basic engine was used in turbocharged application up to about 70 PTO HP, so it was loafing in the 533.
FWIW: I replaced the 533 with a Kubota L6060 hydrostat in 2016, knowing that the 6060 was a guzzler. The L6060 has a 4 cylinder 148.5 CI turbocharged engine rated at 53 PTO HP and is a dream to operate but it uses about three times as much fuel to mow the same parcels with the same mower as did the 533. I do, of course get the work done more quickly.
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