My L400 2.4 Litre gas fuel use is the same as my L300 in town but better on the highway. The L400 V6 gasser should be a great highway cruiser with much improved (highway) fuel mileage.
With a full load of camping gear and boat I drove Coquitlam -Wiliams lake before a gas stop and return with one fuel stop. My speeds varied to 140 KMH with lots of acceleration at highway speeds. Loaded the L400 2.4L gasser was great


Off road my L300 was the same as my L400 gasser's fuel mileage but on the highway my gasser is better . I enjoy both L300 and L400s.
I'll be super interested to drive together with any of the other Delicas to compare at the pump and weigh scales.
In summary please remember they're all good vehicles. .
Don't quote me on this but "I think L400s all use the same transmissions, drive train, brakes and suspension components. Interiors are the same dependent on the model you choose. Fuel, engines and fuel tanks may be the only difference.
TLGF