Modern diesel engines for US regulations have way more electronics then gas engines. They have electronic fuel injection just like gas but operate north of 200 bar pressures. They have EGR systems with cooling = extra plumbing = another source of leaks. Particulate filters, if need replacement, cost more then the engine and during the "regeneration" process you are wastefully burning fuel. NOX sensors ( kind like O2 sensors) cost north of $600. Then there is the exhaust fluid, plumbing and injection system. I'm BMW master tech and work on cars for a living in a dealership and I can tell you that modern diesels have as 3 times the amount of coolant lines,hoses ( source of leaks), 2x the amount of electronics and then there is the turbo and turbo plumbing to deal with (additional coolant and oil lines to leak).
Also the maintenance cost more and has to be performed more often.
The older diesels with mechanical injection are absolutely awesome but then when comparing to modern gas engines , the MPG difference is almost negligible.
Unless you are planning to haul/tow a lot of weight, gas engine is more cost efficient (keep in mind the comparison to modern diesels in US) in the short and long run.
However if I had it my way, I would love to have a land cruiser 79 v8 diesel made for Australian, New Zealand market...