First of all, have fun
You will have so much idling near Le Mans when arriving and leaving... I'll think about you
Get a full jerrycan into the trunk, it will not handicap you. Do you have a manual pump under the hood in case of running out of diesel ?
On the way back you should slow down, your friends and you should be able to come back home without any help
Your friend is a lot lucky to not be French. At 200km/h = 130mph (in fact as soon as PSL+50km/h 31mph) I would have the car immediately confiscated and I would have been in prison all week-end long...
Denis.
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