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t vago · 06-25-2013, 11:04 AM

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.

06-25-2013, 11:04 AM	#2 (permalink)
t vago MPGuino Supporter Join Date: Oct 2010 Location: Hungary Posts: 1,807 iNXS - '10 Opel Zafira 111 Anniversary Suzi - '02 Suzuki Swift GL Thanks: 830 Thanked 708 Times in 456 Posts	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.