actually since they run much slower in the rpm range they dont use a whole lot more
gas then a higher reving 25 or 28 does. and they have massive torque right off the bottom
of the rev range. the only dislikeable thing about them to me is that they are a pain in the butt
to start when you first break them in.
it take dang near 35 minutes to idle through one tank of gas on those things.
as for putting it in the savage, you should buy a few extra of everything in the drivetrain
because you will eventually break something.
good luck.