The beauty of the ATTA auxiliary tank is it does transfer fuel in to the OEM fuel tank whenever the OEM tank gets below a certain level (on my truck it does it at below 3/4 full) which means your OEM fuel gauge is always accurate. On my truck there is no way I am going to run out of fuel in one driving day no matter how bad the winds, etc. are. I love having to never worry about fueling up while the trailer is attached, only after we have stopped for the day (or the next morning).
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