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Old 11-30-2012, 04:17 PM   #22
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Joined: Sep 2012
Location: Paris Landing
Oddometer: 145
Yeah a 20# tank should hold 4.5 gallons which is 80%. You only fill them to 80 because your actually just burning the fumes off the top. I know Blue Rhino and several of the other exchanges only put 3.5 gallons in the tanks. Some of the refill places also charge you for a full tank even if they only top it off which is insane. We refill tanks at our families gas station in west TN. A 20# tank is $18 plus tax, or $4 per gallon.
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