Pretty sure that GM's curb weight is with a full tank of fuel. If you're at a true 1/3 tank, then that's 6.27 gal remaining vs 19 gal full. At ~6lbs/gal that's a 76lb difference in fuel weight.
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John
13 VR 2SS/RS 1LE (sold)
01 Z28 M6 HT
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