David,
I dry-camp A LOT, and always want my fresh tank as near to full as possible, so fill best I can as near to the campsite as possible. Used to lose several gallons out vent on way to site after filling, no more since using a foam plug in vent. Agree that the tank needs way for air to get in/out, but apparently the vent fitting may be too low to get the tank to the 95-100% point. Have seen 94% on mine when level and take a lot of time to fill tank. Just the least bit off-level to off-door-side will have a big effect on how much you can get in.
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2016 Tiffin 40QBH
2015 38RSSA--traded
2005 36TK3--retired, but it was a good one
2017 F450 KR
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