As of a few years ago, French government was beginning to increase taxes on diesel fuel (which for decades has been deliberately cheaper). I could read in the press this is due to modern refining capacities : more gasoline (or stuff usable as gasoline) comes out of the processes than used to. No word on this on TV or in the political realm.
Perhaps more energy and material are used on processing, I have no idea about that. But that's a good, and "environmental" enough reason to use more and small, efficient gasoline engine and less diesel.
What apprehension I have against diesel is mostly that recent modern ones are so complicated, high pressure and whatever, that they're rather unreliable and repairs cost a ton. That may be a huge waste. Similarly, hybrid cars are so costly to build they may be a waste overall. Lastly, I believe that ideally a car ought to not be used for daily commute. What about keeping one for two decades, not put many miles on it, have low and cheap maintenance. Also gasoline engine have interesting recent developments, more powerful but still small 3 cylinder and even 3 cylinder turbocharged.