Crappy Gas mileage - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat
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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 11-11-2007, 02:17 PM   #11
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I then pulled the platinum plugs and installed good ol Champion coppers going one hotter on the heat range. You wouldn't believe the power and mileage increase!

Can you explain this so someone who doesn't know a ton about cars understands enough to explain it to his mechanical friend? Thanks!
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