I am unsure of runtime at this point....My track is shut down and I wont be able to get one onto the track myself till next spring..... The C6 engines that I have modified all ended up being extremely good on fuel..So chances are good this engine will be good on fuel as well......With the modifications I do the engines typically become more efficient in general, and based how crispy this F11 runs I am going to guess that it is indeed running very efficiently....I wish I had more data to offer, but this engine is still new to me....Its kinda like a modified C6 on steroids !