well my mpg on the way home dropped to 24.1 , I doubt very much it was anything to do with the remap, except that it made me feel the urge to boot it everywhere, which I did. And why not? It was like I had a new car. The power is more noticeable in every gear, a significant difference in 6th at 70mph, it's smooth and constant up to 100 (i didnt go any faster).
Depends how ferocious the gear change is really, mine only spun in first and second but I heard someone mention third too. Would recommend r'tech to anyone, ben and nick definitely know their stuff
Jon