I too have found that Michelin Pilots improved my mpg on another Honda fuel miser. My CTX700 came with Bridgestone Battlax from the factory (R=160/60R-17 and F=120/70R-17). In very warm weather, I could achieve at or about 76 mpg for my commutes from tank to tank with the OEM tires, but since replacing them both at or about 9300 miles, with the same riding gear, and the same, approximate accessories, with new Michelin Pilot 4s, riding the same style, speed, route, etc. I've so far been able to achieve at or about 77-78 for that same daily commute.
At this point, I can't really nail down the Pilot advantage for sure, but I've seen enough to know that I am achieving slightly better mpg than with the Battlaxs', even as the Michelin's probably have more grip than they'll have later in life. Since taking my bike back out of retirement in June, it's been hard for me to get a real good feel of it's average commute mile mpg, as I've been on a long trip or two and a couple of charity rides that have put me over 80 (one charity ride tank returned 83). But also, I've done a couple of tanks with more than normal in-town riding, however, I'd say that so far, I've skewed the numbers upward to this point and my fuelly average is at or about 78.3.
Also though, if one looks at my record, it appears that when the tires were brand new, I wasn't returning the same kind of mpg (once I measured the error and went back and adjusted) as I have been on the last seven tanks. I'm going to assume most of that improvement comes from the fact that the tires weren't broken in at first, and it's not some other factor. It could be that the temperature has really heated up since early June. My bike really likes hot weather for great mpg; and cool mornings will really drop the mpg; especially for commuting.
http://www.fuelly.com/motorcycle/hon...gregsfc/436601
One thing I noticed that does slightly reduce the perceived improvement of the Pilot 4s for me is the amount of optimistic trip meter error versus OEM. The Battlax's measured less than 1% optimistic versus a couple of GPSs; testing two or three times to ensure consistency; but the P4s have consisitently shown slightly more than 2% optimistic error. As such, I multiply my tank-ridden miles by .978, so that I know I'm reporting a conservative measurement of mpg. So while the P4s are definitely giving me superior mpg to the OEM tires, it's not as big a gain as it would show if I didn't check tires and vehicles against GPSs for accuracy. I learned to check for this back when I once replaced tires and my mpg seemingly plummeted, but in reality, the tires I thought were giving me superior mpg, were actually 10% over estimating mileage; whereas the tires I thought were killing my mpg, were actually only 1% optimistic, and my real mpg loss was only 4%; instead of what the calculator was showing me w/o accounting for trip meter accuracy.