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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.
Scrabble-
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.
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Send Avon tuning an email for some advice re the remap and dpf, they have a good reputation.
TRA
Haggis
My van (huge, relatively blunt frontal area) gets great economy at 55, then starts to really suck as the speed goes up from there (as aerodynamic drag is the square of speed IIRC).