I have this same tuner and like it, except it is large and hand held so hard to leave connected if you need on the road data. I am hoping 5star can just email me the Bronco tune to upload to it in addition to my current vehicle, it can hold several tunes.I use an SCT X4 tuner with a 93 Octane Performance tune from 5startuning.com for my 3.5 Ecoboost. The SCT X4 tuner can change a ton of things through the OBD port. You can calibrate the speedo, tire size, account for bolt-on upgrades (though you really should send these types of upgrades to your tuner so they can account for it when they are designing your custom tune), plus a ton more. You're still looking at $400 though for the programmer. Like Zack said, you can go to a dealership and they can recalibrate the speedo for you for probably $75 max (I would hope anyway).