hi guys, i have a 1.6 petrol focus auto 2010 which is a bit heavy on the gas,just down the road from me a autotune garage has opened with promises of lowering fuel consumption by 25% or even more. has anyone tried this, if so could you please give me details of the highs and lows, and would it have any effect on guarentees. thanks in advance. ps the price is 200 euros. kelsan