Q5 awful mpg

My mistake I meant to say 200ml of 2 stroke. I bought a dozen small plastic 250ml bottles which I put in 200ml of 2 stroke and 50ml of Millers. I added that to every full tank of the 2 diesel cars I was running at the time. I did that for about 18 months.
Then another engineer friend of mine, who I told about adding 2 stoke oil, contacted Shell UK and they sent him a detailed reply advising against doing so which he sent to me but I didn't keep. I also read on another forum that because it has zinc in it it can eventually block the injectors. So now I just add Millers. I have the 70 litre fuel tank on my Q5 so add 70ml of Millers every time.

Biased reply !

JASO B or C ?

Just an update
Just wasted another £300 having a dieselgate rollback and a remap
Car is exactly the same...on motorway at 70 can just squeeze 40mpg on straight level part
Around town druving like miss daisy it avg 19mpg
So tired of this car and about to sell the dam thing
So wish i had my 2.7tdi a6 back
Using twice as much fuel in this q5