Bienvenue sur EM.com Denis. J'adore ton prénom
My cars aren't so old (see them in the garage), but I'm also trying to get the lower CO2 emission from them.
The first thing to do is to have a fuel log, it shows you where you are and how you are improving. This is so motivating. Register your car in the garage and fill your log tank after tank.
In my part of France, near Toulouse, an A/C is useful several times in the year.
What about showing us some pictures of your 280S ?
Do you plan to eco-mod your car with front grill block, rear wheel skirts or anything else ?
You should think about an
MPGuino
I do not have the skills to modify anything under the hood
Have fun,
Denis.