I have the BD kit with the Garrett 28 turbo. It will totally depend on riding conditions, how you ride and boost levels. If we are trail riding I am right with a stock Apex. If I am into the boost a lot or in deep powder pushing it, I will suck fuel down really quick. There are times that I am on empty and the stock Apex still is at half or better. I carry 2.5 gallons on the back and when I run out, I use that to head back to the trailer.