fitted mine a few mounths ago get 2 to 3 mpg more but that aside its a far nicer car to drive with the synergy fittedJust refueled after fitting the Synergy with new MAF and in cab switch also adding 2 stroke, all local driving with no high speed or Mway. Fuel consumption before fitting the Synergy and adding 2 stroke 29.7 mpg Fuel consumption after 29.8 mpg. Synergy set on 7 and eco mode, new BMW crankcase breather and EGR bypass. Now my question is how do I convince my Wife that the £270 I spent on the Synergy was a worthwhile investment. BUGGER