Well since the titel of the thread is best runtime pipe/engine combo I am going to have to say my modified B5 on a 2013 ...run pretty much every engine under the sun and have never seen any other engine rival its runtime in Truggy...And thats doing it at a hauling ass pace too...this engine barks out big power and sips the fuel while doing it...sorry to seem like I am tooting my own horn, but this engine is really good on fuel and I would be lying to say any different.