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#18
08-11-2011, 04:45 PM
Hummer Veteran
Join Date: May 2010
Location: eastern New Mexico
Posts: 131
Re: Increase mpg easy
One of my friend's dads does something similar and swears by it. He is currently testing it out as well and is going to tell me the results. But he claims more drastic changes in fuel economy than 2mpg, more like 15mpg. If it pans out I'll throw it on here and we can combine all these products for the most fuel efficient vehicle ever.
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2003 Hummer H2
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