There are some stock RPM limitations (seriously -- you can't get it to rev it past 5,000 RPM without it going totally flat on you) on the stock bike which include the stock air filter, stock lean jetting, stock muffler and the stock cam.
You should live so long as to see 6500 rpm on a stock Savage, in other words. You will naturally, normally and automatically shift at 4,500 rpms when the power starts to go flat ....
Once you start the heavy side of the mod train, things change -- especially with the Stage 2 cam.
You just about double the effective strong pulling section of your power curve with the Stage 2 cam. When you over do it, your valves will float harmlessly around 6,500 rpm if you are using the stock flat topped piston. Lots of room up top and no chance of a piston/valve contact with the stock piston.
Gas mileage will suck, but
there is a lot more area under that hp curve than previously seen.