Salut, Pierre-Alexandre! Bienvenue a Ecomodder!
When I read l'Escargot in the title, at first I thought of this:
Pas exactement la meme chose!
Congratulations on already going from 12.x to 19 mpg - that's a huge savings, as you already know. (Are you talking in US mpg or UK mpg?)
Quote:
By the way, do you think I left enough space for air to come in (I suspect weird english here  ?
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Perfectly clear. (Mieux que mon francais!) Because of living "up north", the amount you can block changes a lot from season to season. On my little car, I can nearly fully block my front in the winter, but not in the summer. If you are going to do this mod, you just have to monitor your coolant temperature. (And set an alarm on your app, if it has that option.) Also, make it very easy to remove some sections if it's getting too hot. Don't heat stress your engine!
And before you make a roof rack, consider other options. (Trailer hitch mounted platform?) Carrying on the roof is the worst option for efficiency.
Also consider: aerodynamic mods you make to the rear of a van will have a big payoff. Folding aero panels, like on transport truck trailers, or a boat tail will help.
I updated your post count so you can add images now, si tu veux.
Happy St-Jean-Baptiste!
Darin