Yes, absolutely. The Transporter is blessed with the drag factor of a brick wall, but also winter brings lights, heaters, etc which also puts extra load on the alternator, which in turn puts load on the engine.

As a quick aside- why are so many of the new EV's so badly designed in terms of drag? The best is probably the Tesla model 3, which just happens to have the best range.
 
Bit nerdy but I thought I'd share - I did a roundtrip to Cornwall from Bolton this weekend which was 600 miles in total and despite a bit of traffic on the way down I managed 44.27 mpg in my 2019 150bhp kombi with a fixed solar panel on the roof rack

I stuck at 60mph all the way and did about 50 miles on the way back tailgating a couple of hgvs which helped a bit
 
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