(No - not another complaint!)
I was driving to work from the dentist today along the B4100 out of Bicester. The main stretch is NSL so I was driving at 60mph. Now it's a fairly flat road but is gradually rising toward the A43 and does have a couple of slightly steeper inclines. What I noticed was that on the fairly flat parts the engine was doing just under 2,000 rpm. On the slight inclines it jumped to 3,000 rpm. Now first off this is not a dig at the CVT. That performed the jumps seamlessly and if it wasn't that I pay attention to the dashboard I'd never have noticed. I didn't even need to move my foot on the pedal, it just changed up then down as it needed to.
I'm guessing that 60mph on that road was right at the cusp of the change in the engine operating mode. What intrigued me though was that the economy lights either side of the speedometer were light blue when the engine was at 2,000 rpm but went bright green at 3,000 rpm. I've seen this before on occasion. Accelerating at 3,000 rpm I sometimes get green lights but when I ease off the lights go blue until I lift off properly.
It seems odd given that presumably the engine was doing more work when maintaining speed up the slightly steeper inclines than when maintaining speed on the flatter bits. I don't think it's a fault but it's curious.