Thread: GMC Sierra 5.3L
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Old 06-17-2008   #1 (permalink)
larry arizona
Water Injection Newb
 
Join Date: Jun 2008
Posts: 4
Default GMC Sierra 5.3L

I am looking for increased MPG on a 5.3L GMC Sierra. Currently have a aftermarket tune (wait4meperformance) and my MPG is much improved but I am required to run 93 to get the increased MPG due to the type of timing ranges in this tune (still a $$$ savings in the long run) . I am curious if W/M injection will further increase MPG and allow me to use 87 octane instead.

If so, what kit do I need and what else do I have to do to the tune?

HP and TQ increase would only be an added benefit to me. I am most interested in MPG.
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