I've had my 400 for almost six weeks, and I've been averaging just a hair over 60 mpg.
Yes it is very tough to hold it back. 4000 rpm's is just enough to have someone leave tire tracks up your back, and across your helmet. I'm still breaking mine in, with about another week before I can cut her loose and let her run.
My first three tanks all ran 70-77 MPG, then I ran about 65 MG for a while. I dropped like a rock at the first service down to 55 MPG (a problem not unheard of here) and have been crawling back up ever since. Now, I can pretty much count on 60-65 MPG with little or no Interstate driving, a Givi windscreen, a Givi E-52 topbox, and a 320-pound rider.
My 400 started at almost 75 mpg during the break-in, and also dropped right after the first service to about 58-60 mpg. I don't think it's the service, I think it's the 70 mph instead of 45 once I could go 6000 rpm. I'm holding steady at around 60 mpg now. Started to drop again a little at around 1400 miles or so, but thanks to some help here I figured out that my highway commute to work every day is clogging the air filter faster than I would expect. Cleaned it, and now I'm better again.
Some riders are getting in the high sixties and even a few in the low seventies as an average. Your MPG will depend on your riding style and the type of riding you do. I've noticed a sharp decrease when riding at 65-75 MPH over back road cruising at 45-55. If you have a heavy hand on the throttle, you'll also show a decrease in MPG. My worst MPG was just under 52 MPG and have had a high of almost 76 MPG. With my slightly aggressive riding style (for a 400) and mix or local, back road, and Interstate riding, I average somewhere around the mid to low 60s.
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