Compression Ignition Addict
Join Date: Sep 2012
Location: The place where the 2nd amendment is considered illegal.
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Maybe this sound dumb but how about the tires pressure? Low tire pressure leads to drop in MPG. Which oil weight are you using right now? How about the fuel filters, maybe the fuel filters are clogged. Keep us informed.
2005 Pontiac GTO (1 of 645) (LS2 6.0L, 6 speed manual / 3.46 gear) 39k miles
2007 F-250 XLT (6.0L, 2wd, 6 speed manual / 3.73 gear) 42k miles
2008 F-450 LARIAT (6.4L, 4x4, 6 speed manual / 4.88 gear) 38k miles