Vans will be more economical that a pick up. There not ment for driving on the roads most of there lives, there for pulling and working hard and when you go out after a week they will still start, run rich so they don't cut out while pulling.
Had a '04 Navara crew cab, not a bad yoke, used the most fuel, didn't like it, had a few probs with it, never did what I wanted.
Had an '98 hilux single cab, best one ever. Pulled the heart out of it and she still wanted more.
When I got rid of the Navara, I got a '05 Hilux (last of the old shape) great again, well up for work.
Had a ford ranger for a while as well, bit softer that the Hilux, only ever pulled a horse box with that, but I'd take it over a Navara.
Never had an L200, but it is a Mitz, so it can't be that bad.