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Could be completely normal given the time of year. How much you use also depends on the size of your house and how well insulated it is and if you use a programmable thermostat. If the furnace is functioning normally (no problems) then the usage probably has nothing to do with the furnace
The furnace runs when there is a demand for heat. So if it's functioning normally then the gas you burned is what was needed to offset the house's hea tloss for that time. "Usage seems high" is a subjective assessment. To determine how it compares you would have to look at a similar time period with the same degree days with your old unit then compare the usage. I understand you expected better but you've given me no indication that anything is wrong.