I stupidly stuck a few litres of diesel into an empty tank last week (Note to self: don't fill up the car with a baaad hangover). I then filled up with unleaded to dilute the diesel. I felt that the car had lost some power afterwards, but this may have been a result of using unleaded (I usually use SUL). I dropped a can of octane booster in the tank the following day and it seemed to improve things when putting the boot down.
The tank is nearly empty and I noticed this morning that unless I kept the foot on the accelerator, the car would lose power quicker than normal. Is it possible that diesel is heavier than petrol and is hanging around the bottom of the tank?
Ciaran