I don't use fltplan.com, but in ForeFlight for my T210N which has the TSIO-520-R, I use this profile:
climb - 110 KTAS, 24 GPH, 700 fpm
cruise - 155 KTAS, 17 GPH ROP (usually 10,000 - 12,000)
descent - 160 KTAS, 17 GPH, 500 fpm
Those are pretty conservative... I haven't updated it since...