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I was running 55-57 mpg before installing the FatDuc. After installing it and setting it to about 13.5 (1/8 turn richer than standard), the mileage hasn't dropped much - maybe a couple mpg. If I do a lot of 80+ hiway riding, it will dip into the low 50's. It definitely is working, because the stalling is gone and it runs great at all rpms. The bike runs so good I haven't bothered to richen it up more to see what happens. I need to check the plug color. I can see that the exhaust pipes inside are darker than before so it's richer but I'm surprised the mileage hasn't dropped more. Maybe it was originally so lean that it was less efficient before?
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