The OP 'plans to keep it until electric becomes king, probably in 4/5 years'.
Unless all your motoring is within a very limited distance from 'base', then electric will not be becoming mainstream for a very long time. Tesla are still losing billions, every single manufacturer that sells 'pure' electric cars has horrible low sales.
Hybrid (plug-in and self-charging) will continue to gain ground in cars, taking space off diesel. Large vehicles (HGV, etc) will remain diesel for many years to come.
But I'll predict that EV sales will still be a small niche for 20 years or more. The range (real, not 'official') is simply limited by the laws of physics and the energy that can be held in a battery / fuel cell, and people have been throwing money at that problem for the last century without any real breakthrough.
As an example of still how 'niche' pure electric are, Tesla sold less than 23,000 cars in the USA last year. Total new car sales in the USA for 2015 : 17.5 million.
In the UK, new registrations for March this year (the 'new' 16 plate month) were 508,000. Electric cars made up 7,144 of that.
Elon Musk (and others) are very good at getting column inches in the Grauniad.
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