Ditto. It wags all over the place below 1/2 tank, but the low-fuel light still comes on at the right time. I think it only happens while moving, so it seems it would be related to fuel sloshing around in the tank.

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma