The tank capacity is 10.6 gallons, but you can "overfill" it by putting in so much gas that some gas goes into the evap canister. It's been posted here that one can stuff in as much as 13.5 gallons by doing this.
So I suspect you filled the two tanks to different levels: the first to a higher level than the second.
If you always fill until the nozzle clicks off once you should eliminate this problem.
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2006 MT
MIMA w/FAS module
various mods to driver
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