driving real slow, building rpms, my 2015 will start banging out at 7800, even floored in low, 8000rpm is tops……is this normal. top speed? no clue, I don’t have anywhere to ride long enough to hit speed, at 70 my rpm is 8400 yet it seems to struggle and almost sounds/feels like it starts loosing power at 8400rpm around 70mph I have about 150 miles. stock tires, very few add-ons