For the first 3000 miles I had my 1800 Retro I got about 41 MPG. Then I added a "MASK" and K&N air filter and at the same time I did the exhaust mod. Neither helped or hurt the power that I could tell. It did sound better and I also lost 3 MPG (38 mpg). At just over 6000 miles I added V&H and a PCIII ( see PCIII for sale under sale board ). The guy that does the tuning had a kidney transplant and a temporary map was installed until tuner returned to work. Frankly, the map was horrible and my milage plummented to 32 MPG. Bike ran bad but had very good WOT power. I did not want to wait for the tuners recovery, so I removed the PCIII and thought I'd wait for his return to reconnect it. I also did Bare's desmog (removed everthing and used Pete's plates) at the same time. Now. I don't know exactly what did what but there was a dramatic power increase. I mean, no if's and's or but's. Again, it's dramatic! So I played a good bit with my new found power and when I gassed up I had gotten over 41 MPG. I checked the numbers twice. I couldn't believe it but it was true. Then I took a nice 92.01 mile ride thru a half dozen small towns (lots of stop and go) and out in to the country. I was very conservative on the throttle, no WOT, gingerly on the throttle. When I gassed up this time, I used 2.094 gallons (filled it to the very top). 43.94 MPG. I could keep the PCIII and have it tuned but how much better could it get if at all. Hence I have a PCIII for sale. Any body have a similar experience?