Being a heavy car with a tired autobox and low power, it feels like you are always accelerating - something I need to try and avoid.
With it being mechanical pump, I don't even get DFCO
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I have a surprise for you. Machanical pumps has DFCO feature build in. If you decelerate or go downhill the pump turns faster than what your foot demands. So no diesel is pumped to injectors.
Test procedure: Drive downhill on straight slope in gear, take foot off diesel pedal, listen to engine, switch off engine (Don't remove key!! or engage steering lock!!), listen to engine, switch on engine.
You will hear no difference, which means it has DFCO.
Enjoy