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Old 05-26-2009   #13 (permalink)
solitary
Uncle Bob's Love Child
BTK Expert
 
Join Date: May 2006
Posts: 282
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My observations 1982 GPz 550, logging every single fill-up:
2006 (99% gasoline, 1% additives): 47-59 mpg (starting ODO 20,893)
2008 E10: 46-56 mpg (ending ODO 38,53.

So for me, no difference worth noting.
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