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Re:Car Engines: The incredible shrinking machine by dagw on Friday December 11, 2015 @07:05AM (#10716608)
Cars taking up physically less space could be taxed less (or, my preference, large SUVs taxed more).

Norway essentially does this. Taxes are based on engine size and (I believe) weight. The relative price difference between a large SUV and a small, low horsepower, hatchback is much greater than in most other countries. However based on casual observations in and around Oslo, it doesn't seem to have a huge effect on the size of cars people drive.

The real effect is the 'everybody' owns a Tesla since they are exempt for many taxes and thus cost literally half the price of an equivalently performing petrol powered car.

Re:Car Engines: The incredible shrinking machine by david-given on Friday December 11, 2015 @08:13AM (#10716862)
Car tax in the UK is based on carbon emissions. The table's here:

https://www.gov.uk/vehicle-tax-rate-tables/rates-for-cars-re...

It used to be based on engine size; for years I would get cars with as small engines as possible, simply because it would drop my tax by about 1/3.

As for car sizes... it does seem to be having an effect here. A lot of people I know go for small cars, preferring the little five-door hatchbacks. My last one was a Honda Jazz, with a 1.2 litre engine and an absurd amount of space inside; under the new tax system it'd be classed in category D (£110 a year), but I'd be totally unsurprised if the next model made it into category C (£30 a year). My father has a diesel Nissan Note, about the same size, and that is in category C. He's very smug.

Re:Car Engines: The incredible shrinking machine by david_parrott on Friday December 11, 2015 @11:32AM (#10718021)
I drive a Vauxhall Insignia with a 2 litre 160ps engine. Also in band C. Also smug. ;-)