We usually drive with the tank 1/3 full, but if we are going to be dry camping we fill it up completely. I don't think I can tell the difference with respect to the towing. I just normally leave it 1/3rd full to save some weight.
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Dave & Barbara
KenWorth T2000
2005 Mobile Suites 38RL3 #2338
MorRyde IS 8K axles, LazyBoy recliners, LCD tv
Full time since '96
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