My 17 year old diesel doesn't have any of this (dubious) emission control gubbins, but at the last MOT still tested cleaner and produced lower emissions than needed to pass the ULEZ requirements. And yet driving around the M25 yesterday and sitting in the jam between J9 and J12, I saw visible crud coming out of the tailpipes of cars only two or three years old. It amazes me that VW and the 'dieselgate' scandal involved cheat software to lower emissions for diesels fitted with new emissions control devices whereas many of their older engines pre-DPF and other modern 'clean technologies' were just cleaner in the first place.
DEFRA imposed regulations for wood burning stoves designed to increase their efficiency and reduce their emissions but these are often completely negated by folk who think they can burn any old rubbish. At least they banned petrol stations from selling wet logs that had been sat out in the rain on the forecourt for weeks on end.
But diesels are simply more efficient than petrol both in terms of energy density of the fuel and the amount of CO2 produced per mile, or at least they used to be before Euro 5 and 6 requirements hobbled the engines in the name of trying to clean up the particulate emissions.
Don't shoot me, I'm only the piano player. I DON'T work for or on behalf of EON.Next, but am willing to try and help if I can. Not on mains gas, mobile network or mains drainage. House heated almost entirely by baby dragons.