The problem with the G13 is it's mounted longitudinally with a crappy drivetrain.
Even with the bigger G16, fuel economy sucks for those Suzuki-style vans.
The economy drag of front-engine RWD and associated hardware becomes proportionately worse the smaller the engine gets.
That said, I've driven small diesel Suzuki Carry vans that get 30 km/l. I'm betting they'd get much better, however, if they were FWD.
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