Yes Oli, it's gone from a 9% gap in 2001 between official figures and real world figures, to a staggering 42% in some cases, quite scary, but with car makers allowed to manipulate the cars and test cycle, it's no wonder the gaps been increasing year on year.
I don't think diesel sales will drop significantly until the government starts banning them from cities, that's if. Most people who buy diesels live rural where everything is far away, or are people who drive for a living, sales reps etc, so probably won't be affected by new measures. The stricter regs will see petrol cars requiring similar equipment to diesels now, such as GPF's, gasoline particulate filters, as diesels filter out 99.9%, probably 100 if the sulphur free city diesel is used.
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