OP, you may need to have a technician look at your controller, a few months ago I had a high bill (37,000 gallons), had the reading checked, etc. I then manually checked each zone for leaks, broken sprinkler heads for all 36 sprinklers, found 2 that were not spraying correctly, and none broken or leaking. Called tech, he found that some how I had 3 (or 4) watering programs running so I was watering about 12 times per week! He completely deleted all the programs, and reprogrammed then fixed the sprinklers and i am back to normal usage for this time of year.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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