This might surprise some forum members, but I also have a Navara. The 4-door king-cab jobby in auto. Bought new in 2012 and it's now done 78,000 miles. It's avareged 32 mpg in that time, mostly on A-roads - it's hardly ever in town or stop/start traffic. It's the Tech version, so high spec, with full leather heated seats, excellent Sat-Nav, hard-drive music etc.
Yes it's too big for a super-market car park and the ride is a tad bouncy when the backs empty, but it's been a reliable work horse that'll be replaced for another when its get to about 95,000 miles. Indeed, this one replaced a similar Nav we had before that one got to that mileage. But the Ford Ranger will also be test driven, just in case.