Is there a aftermarket ford parts supplyer that sells a performance engine control module,not an add on to existing module?
Could not find performance ECM but if you have an older vehicle,mines a 98,you may get better mileage if you get your ECM remanufactured and they automatically upgrade electronics to improve efficeincy.My wife accidently put high octane fuel in and got 2.5 mpg better.You might try this as it is the best 20 cents for 2.5 mpg deal.The add on performance gizmos I have been told are a joke.Research on dudes!
try autopartswarehouse.com they have some good prices, and the parts are good quality
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