Those figures suggest that they are factoring in speed of hill climbing as well as gradient Jim. The old Twist would climb anything, but very slowly on steep hills, while the Sprint copes well on all but the very steepest and always climbs much faster.
For example, I found my former Quando wouldn't manage a 1 in 5 with it's single rider gear, but on everything up to 1 in 6 it climbs at about twice the speed of my old Twist, whether solo or trailer pulling.
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