if the dynojet kit is installed, most likely is due to the slides being drilled, wrong spring on the needles, clip on the needles on the wrong position,new needle has too much taper, etc. if you are really serious about getting better mpg, i'd suggest either buying all new factory parts but that would be over $400 alone, or find a used carb rack on ebay or craigslist. i've seen them locally for $100 and on ebay for $100 to $300 for a complete carb setup.
stock, these bikes will do 45-50 mpg if you are light on the takeoffs and ride it hard once in a while. when I first got mine, I was afraid of it and would be very gentle with it and even saw 55mpg. now mine has bigger mains, shimmed needles, bigger pilot jets,taller gearing and i still have only seen mileage in the 20's when i do 80 mph+ on the freeway. i consistantly get 30 and above otherwise. hope you enjoy your magna and hope you get it corrected
