I dug this out from my old post last summer...
Motor is new less than 3 hours in the test. I have a feeling that I may be under propped when the stroker loosens up. Not by much.
rpm- gph- mph- mpg-
1000/ 2.1- 6- 2.8
2500/ 6 - 23.5 - 3.9
3000/ 9 - 29 - 3.2
3500/ 12.5 - 34 - 2.7
4000/ 14.1 - 42 - 3.0
One quick blast up to 50 @ 4900.
It seems when you hit 2500 rpm the mph from there on up almost = rpm.
My other two motors where carbed. However at the same rpm rate the gallons per hour where about the same. The miles per gallon changed.
Hope this helps...still flummoxed
on the b2.