As I'm assuming you're referring to some sort of custom job, it would depend on the engine and transmission. Are you referring to a 200/300Tdi or Td5/ a N/A diesel? What transmission, the ZF 4 speed? What model Defender also?
I can't speak to the autos, but my 300tdi, R380 90 gets around 24 around town, about 27-28 on the highway (As long as you stay under 65, another above that it plummets)
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