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The supplied tank is fine, 360 cc, 12+ oz. My Magnum 91 goes 15 min + on 12 oz.

With 91 FX power, standard servos will be OK on ailerons & elevators, but I would go for high torque (70 oz.in. or better) on rudder because of the wide chord, the stress of holding knife edge and the occasional beating from the tailwheel connection.

I would use wheels (not arms) for servo output to ailerons & elevators. Using the holes spaced @ 5/16" from the servo hub (this spacing available on both Futaba & Hitec wheels), I calculate for the recommended throws a moment arm of 1" on aileron horns, 1-1/4" on the elevator horns, and a ratio for pull/pull rudder of 2/5 between spacing on servo output connections and rudder horn connections--so 1" spacing between servo connections and 2-1/2" spacing on rudder horn connections. This would apply with maximum travel settings on the TX for all control surface servos (+/- 45* rotation or more). I like Rocket City horns, if you can find them, or the 6-32 machine screw horns described on the Central Hobbies website Tech Tips page--a bit of work, but a lot better than plastic horns fastened with screws that never line up straight.

These throws will look like not nearly enough to the sport flyer's eye. They are definitely enough for controllable rolls and loops, but conservative enough to safeguard against unintended snaps.

If you can spare a few extra bucks for coreless servos, the Tower price of $30 for Futaba 9001 is an excellent value. You will like how coreless servos fly, and on a nice plane like this the difference is defiinitely worth it.