you can go to 14.7 ish for the pod..
let me explain...
fuel has two funtions on an engine...
its the fuel that gives power and also its used to keep the engine cool....
so if you lean your engine out you can get more power because the combustion temp. rises...
higher the temp the more the power...
but beware. the higher the temp the bigger the risk of frying a piston or damiging valves....
its a double sided blade....
always try and be conservative for street use but for drag racing you can lean it....