Idiots. Possibly a factor of ten error? Of that government 14p/mile less half is excise duty (they then put VAT on top of the initial tax, of course!)
Plain lunatics to state in one sentence it will be comparable and in the next claim a 400 mile round trip will be over 500 quid. Plain lunatics to state in one sentence that charges for poorer users will force them off the road - if the charges are about the same.
Not even a third rate report, or claim, by someone out there!
Just my silly ramblings, but thought I'd post as when I grabbed for my calculator I got exactly 1/10th as you suggested. I've gone for £5 a gallon, and a reasonable petrol car averaging 40 miles, and assumed 60% of the petrol price is tax in one way or another, so the calc was £5 x 60% = £3 revenue for 40 miles = 7.5p mile.
Of course the leccy will also provide income via VAT to the Gov, and cleaner cars should bring cost savings to the NHS, whilst helping the Gov achieve lower CO2 figures for 'free', as I assume the plug in grant will reduce to zero over time as BEV's get cheaper.