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There's 18 gallons of AvGas in those 4 5-gallon gas cans.

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Calibrated sight gage with LED illumination. This really does help identify the fuel level. FYI: 6 gal to the bottom of the lower P-Clip, 7 gal to the top of the P-Clip, 8 gal to the 1st white tie, 9 gal to the 2nd tie, 10 gal to the 1st black tie, 12 g

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The sight gage with calibration markers.

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And this is the 1 gallon measure used to return fuel to the tank.