Just did a pointless but interesting non the less exercise re MPG and fuel costs for the new GTI (yeah boring I know). I was just wondering last night if after having 3 diesel's on the run (and thus enjoying over 40mpg every time), if the change to a Petrol GTI would be something I'd regret cost wise ?
I have my current GTD and my older Scirocco both on the Fuelly site, and looked at fuel stats for the Scirocco back in 2013.
According to Fuelly, my average MPG for the Scirocco in 2013 was 45.5mpg, and the average diesel cost per litre was £1.39. For my 8500 per annum travel that equates to £1,180.50 on fuel.
Fast forward to 2016 and the on order GTI, I am anticipating that driving the same way, that I should average around 33mpg (does that sound feasible ?). At current fuel costs of £1.099 for unleaded (round these parts), for the same 8500 miles that equates to an annual fuel cost of £1,181.50. A net increase of only £1.02 per year

I know one doesn't buy a GTI for economy, but if I could average 33mpg in my normal weekly drive (where the current GTD gets circa 45), and on a good motorway run around 38-40 mpg (where the GTD gets around 50-55mpg), I'd be very happy, as the increase in fuel costs would be negligible.
I.e. for an average of 33mpg (GTI), vs 45mpg (GTD), that's only an additional £323.65 per year (or £27 per month). Think I can live with that.