As it stands I put in 4.19 lt of petrol before I realised. I then brimmed it to the top with 36.60lt of diesel. The tank holds 53lt so its about 7.9% petrol to diesel mix or 1/12th. I have run it home 5.1 miles and felt no problems at 50mph well under 2000rpmI have just read the same in an AA article so hopefully am ok
http://www.theaa.com/motoring_advice...sfuelling.html