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Re: 6 cylinder mpg
My 77 C10 with a 250 and 4 speed gets around 16 mpUSg. When it was under full load pulling a heavy trailer, I managed 9 mpg traveling at 55 mph. The weights and aerodynamics are probably about the same.
Overdrive would probably help a lot and that's what I'm doing on my burb.
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Greg
64 GMC Suburban - 283, NV3500, 14 bolt
77 C10 swb - 292, SM465, 12 bolt
Last edited by greg64; 05-29-2008 at 06:31 AM.
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