To calculate your water usage, read and record the first four numbers to your left. Subtract your previous reading from this reading to determine your usage in HCF. To convert your usage to gallons, multiply the number of units used by 748. For example, if your current read is 055 and your previous read was 052, then you would have used 3 HCF or 2,244 gallons of water. (example: 055 - 052 = 3 HCF; 3 HCF x 748 = 2,244 gallons).
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