G'day Damned67
The D1 is basicaly a first series Range Rover (70--95 RRC) chassis with a new body, tried and proven beastie,the 300TDI in Auto should get about 9/10litres to 100klm but don't discount a 3.9ltre V8 on GAS

if it has scuber tanks in the boot with a false floor and still has it's original tank it is a very handy vehicle, daughter just bought a 98 for under $6K and 186,000klms

I drove it back from ACT last week it gets about 350klm for under $50, I have an 85 RRC that has been on gas since 1996 goes well at 254,600klm. as well as a 300TDI Auto D1 with 330,000klms up.
Look for water leaks around the glass and on the floors,sunroofs in particular,and split rubber window seals from sun damage,steering should be positive with no free play and no wander,and if an auto the 4spd ZF should change up and down smoothly.if there is a clunk on take off or on slowing it could be the "A"frame ball joint,which can wear, an easy fix but frightening to a newbee.
cheers
Bookmarks