more a result of the co2 craze. then they discovered diesel contains helluvalot of particulate compared to standard fuels (ops!) and to reduce it you have to bu

more a result of the co2 craze. then they discovered diesel contains helluvalot of particulate compared to standard fuels (ops!) and to reduce it you have to burn at higher temperatures (and now you have NOX) at which point it was too late, at least in Europe, where diesel is usually 10% cheaper to buy and overall 20% cheaper to run, so demand is high enough to keep it alive.