A lot depends on what terrain your riding on as well. A day of riding the mountain roads will be tiring, I'm working on many of those twisties, those that don't work in twisties gotta have gorilla arms. Seems you should be getting better gas mileage on your CSC, I thought my RS was not doing as well as it could, but ~34 seems to be the norm. I do think that suspension on my trike could be better, and that after 7 years of riding the thing, but that's just me. I get up under there and take a look, and it's built like a tank, and no wonder it's a stiff ride. One caveat, if you live in a mountain area an ride often, the you become accustomed to mountain roads, it's a good workout mentally and physically. I live in the flat lands of Florida, when I make a road trip to TN I'm working and paying attention, flower sniffing comes at the pull off, and that's my take on this thread. Hope your CSC treats you better as continue to ride.