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I get about 16 but I have some tranny issues that need to get worked out. I found a "Tornado" for 5 bucks on ebay so we'll see if it's a waste or not. I'm pretty sure it will be. But it's worth a try! I hope to be getting about 19 when my tranny gets fixed.
Overall increase on my first tank with the Tornado was 2mpg's! That was all city driving, i'm going on a long trip next week so I'll post what i get when I get back.