I just assembled the ARF version with the 100 and an APC 15x6 for my brothers second plane. It is quite nice with that combo. The thing takes off in about 5 feet on a paved runway. I did have to relocate the throttle pushrod as noted already.

As far as fuel usage, we are using the stock tank (just under 13 oz) and getting 10 minutes easy. Build-n-flyer have you leaned out your low end, it is quite rich from the factory... if not that may affect your fuel consumption.

Go nuts,
Scott.