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I get about 390-410 miles on the trip meter when the light comes on. That is with mostly highway driving though, everyone drives differently and drives in different conditions and areas, so everyone's answers will vary.
i'm usually getting about 15-18 mpg per tank average. I only drive about 10-15 miles a day. i was getting about 22 mpg in traffic driving 70 miles round trip for work. this is an 06 is350. just had my spark plugs changed too.
I've found that since I went with a 265/30-19 tire that it is almost DEAD on. I stopped taking manual calculations when the in-dash readout was within .1 on five fill-ups in a row.