Word on the street is that swapping the transfer case from what is currently on the car (full-time 4wd, with, in theory, 100% of the torque going back to the rear wheels under normal conditions) to a part-time transfer case that allows rear wheel drive only will gain between 1 and 2L/100km.
That sounds like an insane amount. If I move fast I might be able to get the swap done before the ski trip and then have some real tank-to-tank testing.
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