Yes, lots of hills where I live and I see the %SOC go up on the longer downhill stretches. I have little basis for this assertion but it is as follows. The power consumption meter has 12 segments and the maximum motor power is 108kW. It would appear logical that each segment is equivalent to 9kW. Now the recuperation gauge only has 6 segments. If logic holds then the maximum regeneration energy is 54kW. However, on a reasonable downslope, regeneration might be 2 units or 18kW and that would equate to 1% state of charge/minute. At 30 mph, in 1 minute the car travels 0.5 mile. I hope that puts some perspective to how much you might recuperate on a downhill road. As I suggested, try cruise control, let the car adjust the braking via recuperation and see what happens but if your hill is less than 0.5 mile long, you may see no change in the SOC. The Clarity has half the battery size of the Mazda so if the car recuperated the same energy, the SOC would rise by 2% rather than 1%.