I've had both 300Tdi discovery and Defender 110..
The Disco was more economical most of the time, but i's struggle to get more that around 28-30mpg out of it.
On the weekly commute (200 miles of motorway and heavy traffic) i'd typically be at around 26mpg.
On a run down to Spain last summer we were using similar amounts of fuel to a friend in his 110 CSW.
I did find the disco suffered a bit when using crap fuel in southern Morocco, but economy could be slightly improved using Millers diesel power fuel additive.
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