Could it depend upon how big the satsuma they based it on was....
Like people...not all satsuma's conform to the same size and shape??!!
I quite like the idea of a rebellious satsuma
On a more serious note....If you want to play it safe and eat lots of them, I'd use the higher estimate
Munkypoo....that thought of a rebellious satsuma is very funny!
Size will be the main culprit - but when you are only talking about 25 calories - I don't think its worth bothering with - unless you are eating a barrow-load every day.
I would take the average and count them around 35 calories.