Yes good post (again) MH! I am interested in the GTE as my longest normal weekly journey is 28 miles so I would getting 165mpg equivalent on more than 50% of my car useage - the rest probably around 40mpg. But as I do 9,000 miles a year, that means around 5,000 miles driven on electric at 165mpg.
My GTD is averaging 46mpg long term - so I'm using 888 litres a year - costing 1,003 quid a year.
The GTE will use 454 litres of unleaded at 486 quid plus a further 138 litres equivalent in electricity costs, giving a total of 592 (total cost 633 quid) which represents an annual saving of 377 quid - plus the free tax.... so in reality 400 quid annual operating costs saved (hopefully insurance is no more costly).
For comparison - a GTI at 35mpg* and doing the same 9,000 would use 1,167 litres of unleaded costing 1,249 quid.
An R at say 28mpg* would use 1,450 litres at 1,561 quid.
So in summary, 9,000 mile a year, my projected annual fuel cost figures in UK Pounds:
R - 1,561.00
GTI - 1,249.00
GTD - 1,003.00
GTE - 633.00
* best mpg guess as I don't own one.