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Hi rash, I think mine might not be typical. Don't know why but I keep pretty good records and what I get is what I get.
Engine wise the only thing I've done to this date is I went to and 18 tooth front sprocket and modified the fuel pressure regulator. Stock filter and can. Before I modified the FPR the mileage was rather inconsistent. Ratting around and really pushing it in the hills I'd get 42-44 mpg depending on how I felt that day. On a course like I took the other day She'd get right at 52-54.
Since upping the F/P it's more stable and higher. Now, really pushing it in the hills with my idiot buddies I never get less than 47 and in the same loop in the mountains she get 56 and change.
Though from new in stable cruise mode 52 was normal.
I think what has happened is going to the 18 t. front there is more thrust available and needs less throttle opening to go and to accelerate when needed.
Using the same map the increased F/P will en-richen the F/A ratio but also I believe give a much better spray pattern providing a better mixing in the chamber and a better burn. This I think is a bit more efficient again requiring less throttle opening for a given situation.
These may be "busy theory's" but in my misspent yout I tuned a few injected and blower cars and this seems to make sense to me.
Whatever the reason my bike likes it and I have about 6000 miles with this combination.
As far as power the real world dyno for me was on hwy138 from 97 to Crater Lake. Straight as a string for about 10 miles.
There was nothing to be seen so I pinned it until I shut off at 8500 rpm in top gear due to the buffeting off the Givi bags and the back end was knocking around a bit probably because the rear tire was about shot. But the way it was pulling I'm pretty sure it would have hit the rev limiter. This is at the 6000' elevation level. Of course the air is less dense meaning less drag but also on the other hand the mill is down on power too.
So I guess it's a wash.
It does sound like you are a little low in the mpg thing.
how many miles do you have?
Don
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