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Im not trying to hinder your experiment, but it would give you more results to analyze if you drove longer distances between diagnostic/parts changes. I'm following this thread closely because I'm a bit of a mpg nut too. I get 53 on my street bike and average 17 half city, half freeway in...

unless you are filling it all the way up the filler neck, you can still easily be off on that small of a fill up.

you aren't going far enough to really be accurate. at that level if you had gotten in only .3 gallons more your numbers would be way off what they are now. you need to get into the 10 gallon or so fill-up range.