Well I ran the Shark9 which is basically the same engine minus a tungsten weight in the crank. Depending on track conditions I was getting anywhere from 9:45 to 12:30 in a buggy. If you have good throttle control and have been able to get good mileage with other engines you should have no problem with the X10.

Also I run the RB 2045 pipe and 192 header in buggy. You can get the engine to make more power with some of the JP pipes and other random pipes but you will not get the same fuel economy.