Thread: The fuel efficient GMC V6
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Old December 19th, 2021, 11:37 AM
Prowbar Prowbar is offline
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Default Re: The fuel efficient GMC V6
Quote:
Originally Posted by BillT View Post
My all original '66 1000 with a 305E got 15.5 Highway right after I "super tuned" it.

I was pretty satisfied with that.
Hello Bill,

If I may ask, what do you mean with a super tune?
Also, what gear ratio did the rear axle have?
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