150/50 jets, dyna muffler, k/n filter...

I've got as high as 72mpg, cruising a lazy winding road in 4th at 35 or 40mph...
... as low as 48mpg doing 75+mph on the freeway...
Usual, is in the low 60's...

No noticeable difference in mileage over stock...
It's all in the wrist...

My 06 has a 100% stock engine.  In fact, the only mod is a Suzuki windscreen and I average 58 mpg.  I've done as high as 63 on 45-50 mph country roads and as low as 48 doing mostly highway.

These comments all seem pretty realistic...

Figure, high 40's to low 60's, average... You might get a bit more or less with extreme riding...
Anything much further out, and something's wrong...
Engine mods can help or hurt, depending...
Weight, can add or take away a few...
... switching to chain, with higher gearing, can add a few highway, and loose a few in traffic...


If you really want more power, get a bigger bike...
... and if you really want more mileage, get a smaller one...
You can tweak a little one way or the other... but you can't make a donkey into a thoroughbred, or visa-versa...
What we have,... is a quarter horse...
Quick but not fast,... thrifty but not cheap...

Just switching to a slightly taller rear tire can make a 5% difference...  
... if you push it to 10%,... with tires, gearing, jetting, or whatever,... you change the character  of the bike completely...
...might as well have bought a Virago 250 or a Ninja 650...


"When the wind blows from the South, I know the difference between a hawk and a handsaw" -Hamlet

60mpg @ 60mph, have to go to reserve @ 120 miles. Engine is stock, machine has a windshield. Regards, Jim.