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You will appreciate this because, not so long ago, a disaster occurred that swept the automotive world like a global tsunami.
Volkswagen had been caught cheating.
The news slowly seeped out as country after country declared war against them. German diesel tailpipe emissions were not as we had been led to believe. The industry and the public had been mislead by clever engineering and frankly, blatant lying. 
Heads rolled at VW headquarters, and the new “men of motors” who replaced them, vowed we would never see this underhand trickery again. Branches of the VW empire – Audi, Skoda – pulled their corporate heads in like terrified turtles but the damage was done. Worse still, owners were told their vehicles could be adjusted but – and this is the crucial thing – their VWs would never be quite as good again.
Many European nations charge some form of tax for the use of vehicles on public roads, a form of legal highway robbery that is at its worst in the United Kingdom. Here, vehicles are taxed on exhaust emissions primarily. Fortunately, at the time of writing at least, the governors of Europe have yet to adjust upwards the amount of tax that offending cars will have to pay.
Nevertheless, this cheating has had an effect on the sales of new diesel-powered cars.
Diesel fuel and cars have always attracted price premiums anyway based purely on the fact that a diesel will always provide...