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well ive been usin it on my audi a3 1.8T, a year back! it realy does improve the mpg! but i start losin abit of power! when i give a bit of a stick!
Stick to shell V -power! does the job and keeps the performance up!
 
Oh my god ive come on here tonight to ask the same question about the redex stuff as i put a quarter of the bottle in last last when i filled up and today shes been running like a tractor surely cant be coincidental a coil pack going at the same time??? But tomorrow ill take her for a spin and see if i was just imaging it!
 
well when i bought my adui a3! it use to drink alot and the mpg on the clock was quite low, pour the whol redex in! the mpg started rising slowy, only gave me around 7-10 miles extra