I am getting around 46-48mpg in the 184
Round trip to work is about 22 miles which is about 4 miles of stop start traffic in 30 mph and the other 18 miles is dual carriageway at 50-60mph.
Last three tanks were filled to first click and have been using Tesco fuel and all three have given about 460 miles to a tank to near empty with around 20 miles showing left in tank.
This is with mixed sport and normal, have not bothered with Eco at all.
Filled up with Shell V power diesel + nitro on Saturday so will see how this goes on mileage and let you know.
It seems to be around £5 more than regular for a full tank of fuel.
Car sounds like it runs smoother with the V power and will see if it can match the regular diesel for miles.
Car has also done 2.2k miles now so still a baby