If you got down to the dregs in the tank after 41k miles, it might be your picking up some crap from the bottom, partially clogging the injectors.
If its bad, fuel injector cleaner may not do it.
If it were me, I'd take the tank off, swill it around with gas I knew was fresh couple of times, throw it out. Then fill it up, take it out for a real thrash and see if that cleared it.
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