I've not heard of that one before but I wonder if it has anything to do with it being farhenheit instead of celsius? The cars here in Europe would all be celsius and go up by 1 degree increments, something that mildly annoys me as on a BMW courtesy car I had recently you had 0.5 degree increments and they're probably the same heating systems. 21.5 degrees was much more comfortable than 21 or 22 but I told myself to stop being so fussy. The 2 degree jump your car has would really annoy me though, maybe someone else from the US can confirm if their temperature control does the same?