David Harris
Expedition Leader
Be careful what you are reading, imperial MPG is very different.
Those old indirect injection naturally aspirated diesels arent that efficient. A 200Tdi in a properly geared Series will brush up against the upper 20's but that is a whole different animal.
Could have been the 2.5L they were quoting, which shares the design with the 200 Tdi doesn't it? Good point on the imperial conversion. That would drop the mpg down to the 22-23 mpg range. Doesn't the petrol get in the teens? If so there is still some economy advantage to the diesel.