Sequential will give you better MPG even on a competition engine, that is FULLY sequential not semi, in fully s mode the injector fires as the inlet opens, it does this at ALL engine speeds, as the cossie uses injectors that are far enough away from the inlet valve there is plenty enough time for fuel presentation/mixing, at higher rpm there becomes a much smaller time for fuel presentation(mixing with air) as everything is that much faster, in an ideal world you would have one close injector and one far away injector for each cylinder, and have them change over from close to far at high rpm and load.
Even running back to back tests(at emerald) on batch fired and fully sequential there is so little in it, but hydrocarbons are a lot higher with batch fired.
tabetha