Oil and bigger gas tank were first things to get upgraded on mine. Like you I was getting 55mpg until it got broken in. Now I get 63 - 65 consistently and I have seen 68 - 70mpg. As others have said don't be wimpy with the right wrist and change the break in oil after a few hundred miles. The best is yet to come.

 

I've always wanted to use the statement that I've seen others use on some posts like this one, so here's my chance.

HOLY DEAD POST RESURECTION, BATMAN!

So Bigs...what gas mileage are you getting.

 

About 55 mpg at present

 

last tank i got 31 kml and the tank before i got about 28 kml about 65-73 MPG