That will get you a Merc C class. You will get 38MPG on a run, with a 1.8 Kompressor and 170bhp so plenty of go.
The MPG suffers quite badly on stuff like the school run.
Go drive any of the rest, then go drive the Merc, you will buy the Merc.
I dont understand why you want petrol specifically mind you.
This is exactly what I have.
I get:
25mpg for city stop-start driving
34mpg for a 7 mile town and motorway commute to work
43mpg for a 100 mile run up north on windy A roads.
In the 2,000 miles I’ve done in it since I bought it, my properly calculated mpg is around 33mpg, which is pretty good considering my girlfriend’s 1.25 2008 Fiesta is sitting at around 39mpg.
I can hit high thirties/40mpg on motorways quite easily if I’m light with my right foot.
I drove a 3 series touring (lovely but quite harsh), A4 estate (which I liked), a 5 series (nice but not enough space considering its size) and finally the Merc. I wasn’t even seriously considering the Merc until I saw it/drove it. it’s lovely. I look forward to being able to get in it.