Just a quick vid of recent pseudo test between Charger Nuvinci and GX Touring. For those not in the know, GX Touring comes with chain, 11 gears, derailleur (2nd bike in vid; colour yellow/curry). The Nuvinci (1st bike; white) is a constant variable hub with a belt drive. Sometimes proudly, other times not so proudly... I'm well over 200 lbs and I do a lot of biking. The reason I don't make it to the top of the hill with the Nuvinci is because of the Big Ben street tires; I'm also out of breath at the top on the Nuvinci. Perhaps the 8 gears of the Nuvinci isn't enough. The 11 gear chain and off-road tires of the GX Touring gets to the top no problem. GX wins uphill (surprise!) but I'd rather ride the Nuvinci on the road.
Rant and ride safe.