[Joe67]

Originally Posted by 67 C-10 LWB

I've seen before where exhaust systems claim better mpg as well as some hand held programmers and PCM tunes. However, which combo? so many choices, so little money

I know. There are a few guys on www.fullsizechevy.com that know tuning and exhaust inside and out.
I went with a Flowmaster 50 single in, dual out with the factory diameter tails. They dump similar to a Buick GN style.

I still run the antiquated Hypertech Power Programmer III (HPP3). When I bought it, the custom tunes were no where as cheap as they are today.