ERD50
Give me a museum and I'll fill it. (Picasso) Give me a forum ...
Yeah I'll call them tomorrow but I don't expect much more than "oh yeah it's fine, we checked it real good". Not sure how I am going to prove this, especially if it's intermittent like this.
Might not be the meter. 1,700 G in 24 hours is just 1.2 GPM, like a faucet. Or 2.4GPM for 12 hours, 4.8 for 6 hours.... something (like that sprinkler) sure could be leaking that much and maybe flows into the ground where you can't see it? Water softener - in flush mode they are ~ 4GPM for some time (maybe stuck), and it all goes down the drain, you would not see a leak?
I think you should do some more Sherlock Holmes work before accusing the meter. Hard to imagine how a mechanical device like that could appear to be working fine for a week, and then just jump up, and do it by about the same amount every month?
In fact, I'll bet right now it is not the meter.
-ERD50