Prices around my house :
- 1.275 / 1.332 diesel 51 / 55 (cetane)
- 1.355 / 1.443 gasoline 95 / 98
Diesel is cheaper thanks to taxes. Not to advantage it for CO2 because these taxes differences exist since the 70's. Then the petrol companies were producing too much diesel...
Current French ecological intensives on new cars buying based upon CO2 emissions are advantaging diesel, but constructors have since this summer a few little gasolines which have good results as the Citroen C1 and the Toyota Aygo.
But diesel's maintenance is more expensive. Total cost is better for diesel above 15000km/year.
My diesel is a second hand so not much more expensive than a gasoline. As I'm saving 33% on my consumption, I can offer me the best diesel 10% more expensive than lowest cost, which is a 25% money saving
My 11 years old diesel emits certainly more particles than a newer diesel as I don't have a particle filter, but they are always not mandatory on new cars, even if they'll have to use it to respect next restrictions. Ecologically and economically it's better to use it during a few years before to destroy/sell it.
Denis.