Depends on your point of view and how many miles you intend to do, in case you haven't noticed fuel is getting more expensive, I can piss 40mpg in the cossie without trying hard, don't forget the std ecu(selling) will recoup some cost, can be done for less than I imagine you are thinking of.
My emerald K3,(which runs the st's variable cam perfectly) got me an extra 150 miles per tank after a £280 COMPLETE mapping session, which is std price for however long it takes, about 4-5 hours without the variable cam, so add a bit, but as done before he'll no doubt have a close map anyway to start, so can even use car and drive to rr, few around wales as well that map these systems.
The "ridiculous" part is ford not exploiting the WHOLE potential of the system.
tabetha