Best mpg I’ve recorded with my 2023 2.0 TSI Sportline, 52.2 mpg on a 56 mile trip M25 & M1, running at 55-60 mph mostly. Outbound trip this morning was 44.1 mph at similar speeds. I’ve just started using Shell VPower unleaded could this be a factor or just coincidence.

Just a coincidence. I get similar mpg on supermarket fuel.

Most likely outbound trip was against the wind and the return journey was with the wind. That, plus variations in traffic and driving style could easily account for your mgg difference. Different fuel would only have a very minor impact, if any at all.

Edited 2 hours ago2 hr by mj01

3 hours ago, sussamb said:

I get similar mpg on supermarket fuel.

But you don't have a 2.0...