Got mine from MATT LEWIS 01922 692424, ace person to deal with very reliable, I know he is away at moment with family concerns, but is back shortly, and I do beleive going on the net with shop as well!!
Tbh I have not looked for any mpg improvement, but it does seem that it is better at normal speeds, trouble is I did not buy car to do normal speeds, so any improvement in power is used!!
tabetha