Since they used a gas analyzer that option seems to be out. The next is the gearing and the type of transmission. If you read the post scripts our setups are very simular. What kind of mpg are you gettin now?
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1969 C10 Long Step,355,700r4w/lockup, HEI,Weiand,750 Performer,1.6 rockers,Camel Humps,Comp 262Extreme,Hedman,2 1/2"pipes, tele/tilt,SunRoof,ps,Disc pb,ac,Cragar,eaton,Corvette style roll pan, Bowtie louvered tail gate,lowered 2/2.
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