We'll never agree on the 145/6 beauty spot.
No, we wont, but at least you got the same front end as mine.
10/60, sounds a bit thick cold and runny hot compared to Alfas 15/50 reommendation, but it'll keep the variator quieter a bit longer.
And yes OK, North-East to me is Aberdeen, so Darlington Mmmm been there a few times, I don't remember much of the place so it's probably just trying to get away from the place AFAP that's killing your MPG.
So Fill your tank to the brim, go for a spin, sit at 56mph for 1 hour, 26 miles there and 26 back to the garage, fill to the brim again, record how much you put in and how many miles you did, if you have GPS then it would be better than going off the odometer. You'll get your true figure and it'll probably be closer to 40mpg.
But I am geting 140 miles per line on my fuel guage in the 1.6, the old 2.0 155 used to do 100 per line, but that was in Germany and my foot always felt heavy there.