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You could see if you can trigger a DPF cycle to clean it out, but also do consider that it's a van, it's not exactly aerodynamic so it's going to be pretty uneconomical on the motorway.
Perhaps @spotter could provide some experience of mpg as he has a similar van I think.
NurseHolliday
Yes.
@Hefty - that makes sense. Thanks.
It all seems a bit odd, as economy is excellent when pottering, but falls off a cliff over 50. 6th gear just doesn't seem to provide the economy that I'd expect/hoped for.
Oh well. My fear is the DPF is not helping and may be slightly clogged - so when exhaust pressure is higher, the economy suffers - though revs are still pretty low (2k ish) at 60 in 6th.