Newbie who wants a brushless Savage.

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I think you'd be hard-pressed to get a reliable 55mph Savage with a Feigao. You could probably hit that speed with something like an 8XL on 6s with high gearing, but I think the motor would overheat quickly.

I think you need a Neu 1515 at minimum to reach 55mph reliably. My MGT with a 1512 on 6s A123 can hit 45mph, so you should be able to get an extra 10mph with a 1515 and 6s lipos.