Audi A4 1.8t bad mpg

[Michaelhare]

Hi I have a Audi A4 b7 1.8t Quattro b7 which I had stage 1 remap also a milltek exhaust fitted nearly 2 years ago the problem is before I had this done my mpg was around 24 then went up to 25-26 now it’s gone down to 21. Does anyone know why his could be


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