I only have one tank "on" at any given time. When it quits, I switch to the other tank, and know that I have 30# worth of gas to refill the first tank. I've been doing this for 40 years, and haven't run out yet.
Good luck,
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Pull Toy
Steve & Jan, Ava & Emma (Mini Schnauzers):
2016 F350 Lariat 4X4 Powerstroke CC/SB "PULLTOY V"
2013 Alpine 3535RE "MAGIC CARPET IV"
Proud Navy Vet!
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