S4, Tamora, Conti GT
Filled my car up with supreme unleaded from the Esso/Tesco Garage on the A38 Bristol, since then the car has been sat for 2 days in my works carpark, when i picked the car back up today, everything sounds normal and no lights on the dash, but the car just seems down on power and a little sluggish, obviously it has full tank of fuel so extra weight but the car almost seems slow and the torque seems to have reduced, any ideas what this could be.