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    MPG of gasoline brands

    Has anyone else noticed big differences in mpg from using one brand of gasoline over another? I usually try to run Shell 87 octane in my Prius but the local station was out Monday so I went to a nearby Marathon station instead. The car still runs ok but the displayed mpg has dropped to a dismal...
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    Mobil 1 0w-30, 24084 km, 2004 Toyota Prius

    This was recently posted on Priuschat.com and I'm wondering what people here think. Analysis done at Toromont Labs in Toronto. Fe 6 Pb 0 Zn 642 Cr 0 Sn 0 K 3 Mb 70 Si 17 Ni 0 Al 2 Na 75 Ag 0 Cu 1 Fuel res. 0.0 Glycol res. 0.0 Moisture res. 0.0 TBN 7.5 Concern here is the sodium, which was...
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