My dad did that with our scenic, the last scenic was a petrol and he just filled it up from empty with petrol.
We did about 10 miles and noticed it was getting rougher. So we coasted into the side and got towed to a garage.
Drained the fuel and put some diesel it, it coughed for a while and there was loads of smoke, but that cleared and all was fine.
2 years and 12K later and it was still fine. Im sure you wont have done any lasting damage
