I wanted to follow up after all the helpful replies, and also credit bulletproof with what seems to be the correct answer--fuel theft! The car passed emissions with ease and readings were in line with previous ones. I'd been meaning to mark the gas cap but failed to get around to it--however, the guy pumping gas today (Oregon is full service only) noted that the cap was loosened and cross-threaded. Added to the increase in petty theft in our hood of late, and I think siphoning is the simplest answer. This tank was a little better but still in the bottom 5% of fill ups over 7 years.
Anyone find a locking gas cap they like, or have a lower tech solution they like? IPD and FCP are both out of stock on the caps. Maybe we aren't alone...
Best,
joe b
pdx or
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