At least a little faster with the one additional cylinder. The cruise rpms would be lower. All the gear ratios in the transmission are exactly the same as your 240d manual except it has a fifth gear overdrive.

The rear end may be a little taller as well. If you are interested in this car have it checked out well before commiting to it. I do not like no pictures of the drivers seat other than a description it is torn up. At the claimed milage I would expect better. Tjhe n/a five cylinder engine does not do as well fuel consumption wise as the turbo five cylinder engine usually. Their claim of a mid thirties milage potential is a bit of a stretch to me. You might see thirty is a more likely senario if not pushing the car on the highway.

Also the thread poster quoting the newer models in the same price range may have a point as well. You can get thirty five mpg out of some of them and comfort is better. I suspect inexperienced 123 owners are going to bid this car up further than it may be worth.