So just to restart this thread, I converted my T6 to 18" wheels and at the same time put Nokian 235/55/18s on. Had them on over winter and they were fine, but noticed quite a drop in mpg.
My question is how much is this down to the tyre and how much is down to the 18" wheel?
Just about to drive to the Pyrenees and it got me thinking - if it's the tyre, would it be worth swapping for something more economical? But Nokians are an all-season tyre, so swapping them off in summer seems like an extra faff.
Any thoughts?
Thanks.