text: Limiting car usage saves gas because you can use someonjes elses gas instead of your own and you can conserve yur gas when ever you really need to use it to go to the store or get something that you really need later on tin the day when you get bac to point A  and see and use your car. "Diesel fuel was blamed, since France has a tax policy that favors diesel overs gasoline.  Diesel makes up 67% of vehciles in France,m compared to a 53.3% average of diesel engines in the rest of the western Europ, according to Reuters." (Paris bans driving due to smog)