I just got a PB of 56 mpg on my last fill up.
I did this on my test loop 45 mph with no stop signs and only a couple stops while testing running light load lean burn around 28:1 A/F.
My plans are to try one more tank full at light load then I will bring in my Hypermiling skills to see if I can pass 60 mpg.
How I got here is a long story and the details can be found here.
http://ecomodder.com/forum/showthrea...ild-26722.html