I've currently got a MK4 Golf 1.8T (Standard 150BHP) and I am wanting to trade it in for a diesel model of some sort, so to make for a better MPG figure, due to increased demands on my mileage. One of the cars I am looking at is the A4 2.5 Diesel. Firstly, will I notice a significant increase in MPG, and how do the two cars compare in terms of power and speed, etc? I know they are roughly the same BHP, but is one still noticeably faster or better than the other? I presume, as with all diesels, that the acceleration of the diesel is better from a stand still, due to the torgue increase, etc? Thanks in advance for any advice.