I have a Raptor petcock on my bike. My old original black engine will do 70 mph in third, 90+ mph in fourth, and I have never been patient enough to see what it will finally do in 5th as it speeds up so very very slowly in the top end of 5th gear. Over 100 mph on a Savage is kinda silly anyway -- you can't really ever DO that in the mountains so who needs it? I generally stay in 4th unless I am tooling on down the road trying to maximize gas mileage, then I use 5th as an overdrive mostly.
Now, what does this mean to you? Raptors are necessary for a high performance engine to flow enough gas to get maximum performance out of that engine. Stock engines, mebbe not so much (while the stock vac unit is still working good anyway).
I also get about 39 miles per gallon when I am wickin', so you can see that extra gas is being used once you begin to play the wicker game.
Not that my engine has very many performance or reliability enhancers done to it, mind you -- the cases are bone stock, as is the piston and the jug.
oh Routy, your special bird is all warmed up and ready .... bon appetite !!