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Old 06-25-2013, 11:04 AM   #2 (permalink)
t vago
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Join Date: Oct 2010
Location: Hungary
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iNXS - '10 Opel Zafira 111 Anniversary

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Not a whole lot, if my experiences were any indication. I ran a 20% UDP on my truck last year, and did not see any beneficial increase in fuel economy.
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