you must spill out how big ur house is
if your house is a 2 story single over 2000 feet, 300.00 is the mim if you want a confortable indoor temperature (20+C). also, your natual gas company dosn't come to read the meter every month, every at least another month reading is an "estimate" based on the previous one, so if you think think this month reading (reading not the dollar number) is way higher than usual, the next month will drop down to sub-average. don't worry, you are not the only one that suffers hefty heating bills. after all $300.00 is not an outrageous rate. but if you get a $500.00 bill like the guy below, I would investigate into it.