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Dpf is definitely a possibility. I don't know if tyres could cause such a difference, but are they different new vs old van? Maybe the pressures or the brand are causing the drop in efficiency. Probably the gearing in the 6 speed is set for efficiency in the urban setting, or slower speeds rather than having a nice long 5th gear that sits at 1800rpm at 60mph.
TRA-
Thanks for the responses all!
It's running exactly the same tyres as I had after market alloys and moved them over.
Maybe the gearing is just not great - which would be a shame as what's the point of a 6 speed if not to have a good cruising gear!
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Probably the gearing in the 6 speed is set for efficiency in the urban setting, or slower speeds rather than having a nice long 5th gear that sits at 1800rpm at 60mph.
This sounds very plausible @Scrabble
I do wonder if some of the Euro 6 emissions improvements have hindered performance on modern diesels. Sounds a bit gammony to suggest that, I have no evidence, just a thought. Wouldn't be surprised with some of the OEM behaviour.
Scrabble
NurseHolliday
Yeah - think that's it. 55 is just slow....
Thing is aerodynamically, the two vans are identical. It's one of these - so basically a big box.
I'd always thought the economy of the old one was pretty good, considering it had a ton of miles, and the engine not a spring chicken. So was a bit sad to find new van with much smoother engine and an extra gear didn't provide the same economy on longer runs - which is what its mainly for. Old van was a 2.2 turbo - new one is just a "2.0 bluehdi" - so maybe it's that smaller engine that just can't hack motorway miles in the same way. The newest ones (post 2019) are back to 2.2
@NurseHolliday - yep - will see if I can get a dpf health check next time it's in the garage. I don't think it's told me its done a regen for a while - but as I've done a fair bit of motorway recently, I think it does this automatically without telling you.