Quote:
Originally Posted by Chateau_Nomad
Sorry to be blunt... but the straight forward answer is to first know what spec your chassis is, and who manufactured it. Unless a previous owner swapped in a different capacity fuel tank, you should trust published capacity specifications from that source... which is simple to find.
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I did similar when I was newbie with my propane tank. It was before I understood about the 80% fill limitation. I had run it empty and when I had it filled; I was under the specifications (18 gallons).
The RV Mfg had me contact Manchester Tank directly. I will never forget not being able to read the tank model number and they told me to get a white sheet of paper and pencil & mark across the tank
I thought they were nuts but it worked. Turns out while my Mfg specifications said 18 gallons it was actually 17.6 capacity and then 80% of that. They were so intrigue with my persistence they actually sent me the engineering drawing of my tank
So it is kind of like when you think the bank has something wrong, you can spend hours or days to learn what you are missing or why they were right.
I have 80 gallon gas tank and never come closer to actually buying 80 gallons to fill up. I normally buy about 50 gallons per fill-up and I complain about that. When I use that Gas Buddy thing, I can never tell them the actual miles per gallon I burn; because I would never drive as long as they recommend without getting fuel. One day I will do the math and load a smaller size tank to get the same outcome. Ironically as I think about it, I may just say I have 55 gallon tank and see what it does; and the OP may need to use 40 gallon tank
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