Will be very interested to hear how you get on with the chipset. I was considering one for mine a while back but, with it being a company car, it was looking a bit complicated insurance-wise as all our cars are on one group policy. I should be changing it in six months and - for the first time - I may have the same again, in which case a chipset might be worthwhile. During my early correspondence with Mazda regarding fuel consumption, I questioned how it was possible that small, third-part, manufacturers were able to produce a small and relatively cheap plug-in device which achieved something that the combined technical might of Mazda couldn't. I.E, achieve better MPG, power and torque. They waffled a bit about "standards" and "homologation", but never really answered properly...
Alan