Re: gas mileage
Great advice on the Exhaust.
It will sound a whole lot better too, lol.
Also as mentioned, give the engine a good "Super Tune".
I had both, a Flow-thru Exhaust and a Super Tune on a lot of my Chevys and I would get some great mileage out of them.
Also important is "how" you drive it.
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'60-'72 Chev/GMC Fan
GMC 9500 Fan
Detroit Diesel Fan
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