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I have an 05 QC with the following mods
volant CAI
ported throttle body
msd wires
magnaflow catback
cats deleted
long tube headers
Stage II flash
Vec II
Rwhp is 478 we average about 14-15mpg on the highway.
and pull my 24ft enclosed trialor with my RC, full weight around 8900lbs and average 9-10mpg pulling
Hope this helps
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