Originally Posted by
TLR 8 4.0
I'm having difficulty finding any sort of decent fuel mileage out of my mito 4. The engine itself runs awesome and has good power and everything, however, the mileage is poor. With the 6.5mm Venturi I'm getting around 8 minutes. This weekend I had a short 15 minute race and pitted at 7:30. By the end of the race my tank had nothing left in it. This is coming from a guy who was running a clio p5 which got around 10 minutes. The pipe/header is 9901/41021.
I know assumptions can easily cause misunderstandings, but usually people with this kind of extreme mileage issue, will have a very fat bottom end tune, which causes them to be on the throttle much more than they should. This lowers runtime significantly.
Check that all your exhaust seals are good, then make a new attempt at tuning it, with the goal of having a crisp, clean bottom end. An excessively lean top end can mask a fat bottom end. So before you tune the bottom end, open up the top 1/4 turn (or more if needed!).