Someone suggested using air-cooled cars to avoid the need for more than 100mls of cooling liquid. 2CV's were mentioned.
Many years ago waiting on a remote stand at Le Bourget, we were next to a French navy plane whose pilot, an ancient matelot aviator, wandered over and scrounged a coffee. The handling agents used to drive about in those 2CV vans, the corrugated type.
He said "We call those vans virgins".
After a suitable pause we asked why.
"Well, they are rather difficult to get into, but quite comfortable once you're in. When you get out you feel a bit ashamed"
If he felt ashamed perhaps he wasn't a true frenchman.
Sorry for the thread creep.