I'm just keeping mine anyway. The goalposts will always be moved in their favour leaving the motorist playing catch up.

Costs to change, getting an unknown vehicle vs a known one, depreciation...

Don't play their game.

I`m doing the same,I bought my diesel because I wanted it, not because of what the government were likely to do tax wise, if your going to worry about what they are going to do you`d buy a bike/electric car but even e/c will be taxed eventually so you cannot win imo

I would get rid when its uneconomical to repair, especially if the DPF and DMF are on their way out especially. Otherwise the cheapest option is to run it in to the ground.

My 325d estate does 500+ miles to a tankful. Close to 600 if I'm doing big motorway runs northwards and back.

The day a differently engined estate can REALLY do that, rather than in the fantasyland of the 'official' economy tests, I'll change to petrol, or hybrid, or whatever.

Until then, I'll stick with diesel, thanks.

Let's use fuel prices in my area today for the calculations :

Petrol : 113.9, Diesel : 120.9

Fuel economy on diesel : 45 mpg (which is what I get driving locally. 50 mpg on motorway runs). I usually fill up when the 50 mile range warning comes on (your numbers assume I fill up with a bone-dry tank)

45 mpg = 9.9 miles per litre = 12.21 pence per mile on diesel.

For petrol to give similar costs (12.2 pence per mile), a litre of petrol would need to carry me 9.33 miles, or be doing 42.44 mpg.

For motorway runs (50mpg diesel), diesel is 11.0 miles per litre, or 11.0 pence per mile. Again, a litre of petrol would need to carry me 10.35 miles to match that on costs, or 47mpg.

A bit different to the 38 mpg you calculated.

I can't see diesels being eliminated from cities for a very long time. All commercial vehicles, taxis, lorries, vans are diesel powered. I can see a penalty system being brought in for private vehicles, probably as an adjustment to the congestion zone taxation plus I believe older diesels will probably attract a higher penalty ( being more polluting in terms of Nox. So Euro 6 compliant motors will probably be exempt or cheapest.

Then I imagine that there will be tinkering with the company car taxation schemes to make diesel disadvantageous compared to current . As fleet sales of diesels reduce gradually, the ratio of petrol to diesel will change towards petrol/hybrid - this is happening already) Economics of private motoring will do the rest -- no doubt assisted by vehicle tax changes to discourage ownership. The economics of diesel ownership are already shifting adversely unless you are a very high mileage driver where fuel economy gains still outweigh increasingly more expensive exhaust /complication servicing and repairs. Euro 6 will shift the bias towards petrol even further due to the increased purchase cost and increased maintenance costs of these diesels-just around the corner. Personally, I shall hang onto my older 1.9 tdi non DPF until it's time to change as per any car but this is the last diesel I intend to own-unless I buy a van!