I have an 03 F4i with two bros exhaust and a K&N filter. I was getting 37 mpg, and now, with the power commander, I am getting 40 mpg. I dont putt around either, I am always ringing out the gears and on an open road, i tend to cruise about 80-90 mph with a occasional blast up to 120+ mph.

The biggest change to the bike was the roll on, and low rpm performance. I can cruise through my neighborhood at 2k rpm with no bucking or hunting of the engine. It is just nice and smooth.

My buddy and i did some comparisons against his suzuki bandit 1200. I dont have to downshift anymore to keep up with him, and 3rd gear roll ons from say 5k or so i will pull away from him where as it used to be pretty even. The bike definately feels more responsive and the added gas mileage was just a bonus.

I am used to seeing the reserve light at 120 miles, I just took a ride out to Luckenbach, tx and back, basically running her pretty hard the entire time doing 100 mph and blasting up to 130 a few times. I have 138 miles so far and still no reserve light....

just my $.02

 

I don't have any low end bucking or surging, and it certainly doesn't hesitate coming through a corner. I see most of you have 03 or earlier bikes with these issues. Perhaps they were worked out by the time my 2005 shipped?