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...FWIW, my 2009 Vibe with 1.8L (2ZR-FE) SIDI engine and 4-sp auto, does something similar. The SGII MPG.inst displal momentarily goes to 9999 then jumps back to a XXX.X MPG reading whenever I shift the tranny into N at highway speeds for coasting.
...the Pontiac Vibe is (was) just a Toyota Corolla Matrix with GM badge and modified external sheetmetal; SIDI = Spark Ignition Direct Injection.
...I will definitely watch during tomorrow's commute to work to see if I see the same 10-times-KPH relationship that you see.
Last edited by gone-ot; 05-16-2010 at 08:04 PM..
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