Diesels are always good on fuel.
Get the external tanks for extra mileage.
I hear King Springs make a super super super low for most modern Torsion suspension systems on tanks 1990 onwards.
Call super cheap and find out.
2000 Legnum Mint with 44589ks when I got it. Now with black leather seats. After 3 years of fun some terminal engine bay wiring issues raised their ugly heads and it died. I Now drive a 2002 Legnum and have retired the 2000 to spare parts duty.