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Mitsubishi Triton: Drop in power

We have just been driving to Queensland in my partner's 2006 Mitsubishi Triton 3.2 turbo diesel, which struggled to get up hills. Doing 110 km/h it would drop to at least 80 km/h. He changed the suction control valve, but it was clean, and his EGR valve was blocked off as he has had manifold problems before. I was wondering what this problem could be?

I would be looking at the fuel supply, the filters, fuel pump, and the fuel itself. If the performance generally has dropped off I would also be looking at the turbocharger.

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