you didnt get a mpg inc. your ecu is being fooled into thinking it is. do the research. unless your larger injectors were scaled to the 3.2 engine theres a good chance your actually washing down your cylinders with the excess fuel and potentially hurting your engine down the road.
amx the e55 injectors are the same size as the srt 480 cc . if you feel the need for larger injectors contact bruce at TUNING TECHNOLOGY MOTORSPORTS and order his fuel rail and 550 cc injectors