I owned one about ten years ago....in fact fitted the engine after I realised that I couldn't afford to run a V8. In a 90 it used to average 28mpg at 70-80mph (80 on the flat or down hills!), driven carefully did about 32. Would pull 5th gear on 235/85R16s although needed 4th on hills. Offroad had more pull than a tdi off boost and in slippery conditions could use 2nd low where a tdi would spin its wheels.
Very noisy, I fitted masses of sound deadening, to the extent of fitting barrier mat between the dash and the bulkhead.
For offroading the sump is quite low so should be fitted with extended bumpstops.