E Class coupe best engine

[shea89]

Wondering if I could get a bit of advice

I have a GR86 and have been using it for my weekly commute 300 mile round trip and then maybe 25 miles a week around the doors, adds up to around 13k miles per year. A second child and the need for something a bit more planted during winter months has forced me to change cars.

So what I was ideally looking for was a Coupe with seats big enough for 2 kids in the back and 4wd, fat chance I thought then I saw the C238, seems to fit the bill perfectly.

I was wondering if I could get a bit of advice for the best engine to choose for one of these, I'm looking for:
2017-2021
Mileage around 75k
As reliable as I can get
Fuel economy to be around 37+ mpg on a run, 30+ avg
No slower accelerating than the GR86.

Whatever way my driving style is I don't hang about but always get great MPG on my commute, GR86 gets 37mpg, e46 M3 got 32 MPG, e39 540i got 30 mpg. So I'm thinking e400/e450 might not be off the table.

Would go diesel, but smaller cylinder variants would be a bit weedy I suspect and I'm a bit wary of the added complexity, had a 5 year old 50k mile transporter before and EGR cooler packed in cost £1200 to replace seems there's always something going wrong with the emissions systems on modern diesels.

Maybe I can even justify an E53, but budget of £23k limits that, there's one for £24k for sale atm with full mercedes service history, but I'm probably down around lemon price for one of those.

Any advice greatly appreciated, thanks!

EDIT: there's some amount of engine options so to remind you
Petrol: E200, E300, E350, E400, E450, E53
Diesel: E220D, E300D, E350D, E400D

Edited by shea89 on Thursday 2nd April 15:13

Edited by shea89 on Thursday 2nd April 15:20