Better mileage for 6.4

jimbob 1155

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Jan 11, 2010
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I am interested in finding the best programmer that will give me the most fuel mileage, not looking for performance so much. I have heard about Spartan tuners giving up to 5 mpg but no guarantee for a $1500 tuner. Any recommendations would be greatly appreciated.
 

Fine69

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Cranberry Twp,PA
Spartan has proven to increase mileage, but it's only on their High HP tunes like the 275 and 310. There is also ALOT of guys reporting blown Headgaskets with the High HP tunes.
 

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