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With the OPD valve on the tank, best fill rate is 80%. Any greater, and the safety will vent it off anyway (overfill protection device OPD).
I currently am paying a flat fee for fill up of my 30 lb tank of $14.00 here in Chattanooga, but that is at only one place. It is an LP gas distributor. So, i only take the tanks in when they are empty. I have payed as much as $30.00 on the road to have the tank filled, flat rate.
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