That handbook extract's interesting...
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So - 2.1DJ vs 1.6TD JX...
Urban - 23.4 vs 32.5 - 40% better for JX
56mph - 32.1 vs 35.7 - 11% better for JX
75mph - 21.6 vs no figure - 100% better for DJ
But the German DIN figures... 1/2 payload, 3/4 max speed + 10% (of what, though?)
Tintop - 21.9 vs 31.0 - 40% better for JX
Hightop van - 20.8 vs 27.7 - 33% better for JX
So it looks like the JX wins hands-down when it's not doing so much, but as soon as you start to give it even a few berries it starts to wilt a bit, whilst the DJ copes far better with speed & load. Still thirstier, but the gap narrows hugely at even a constant 56mph. Wind that up a bit, and I'll bet it's a closer gap at 60-65mph.
Then, of course, there's the intangibles. We test-drove DJ & JX back-to-back. It was no contest. The DJ was just SO much nicer to drive. Quieter, smoother, much much quicker. And it wasn't just a duff single JX - we test drove three within a week or so, and the one we drove back-to-back with the DJ was the nicest of the three.
The %age maximum hill is also telling - 38% for DJ, 32% for JX. Sure, you're never going to really face those in real life - even the worst Alpine passes don't get too much beyond 10% - but it says a lot about how pleasant the climb's going to be. Especially if you meet a tractor, truck or something part way up.