For the engines I have figures for (160 hp and 200 hp) the SFC works out pretty close to 0.20 kg/hr/hp, at most flight power settings. It's slightly better at higher powers, though you'll do slightly worse in the climb itself as the mixture is usually set over-rich for cooling.
Typical numbers would be 100% for t/o, 80-100% for climb (max available power falls with altitude, e.g. 75% at about 7000 ft for normally aspirated), 55 to 75% for cruise, and something like 40-50% for a cruise descent. I haven't got a clue about taxi -- I'd guess a lot less than 20%.
Hope that helps.