iv not noticed anything fuel / mpg wise but the basic law goes along the lines that more air in equals more fuel (altho 14x less), also the biggest benefit of these is that the resposiveness of the throttle is a lot better...making it more fun to press....making you press it a fair bit more...using fuel....! or it could be argued you dont have to press it as often cos your getting more out of it...i think driver style will play more of a part than the actual part.
a load of returns have come back, just done a run on the lathe...i have 3x tb's and 3x maf's...will take to ford fair and do on the spot swapsies....then get back onto the list above, so if your next on the list get ready with paypal i will be emailing soon!
mondeo 2.0 tb's price? about £20 off ebay, less from scrapyard...