The load area is shorter (2,512mm for the 'L1' and 2,862mm for the 'L2'), compared to 2,537mm and 2,937mm for the old Vivaro, and there's less width between the wheel arches, although it's only shrunk by a centimetre to 1.26 metres.
This MK3 Vivaro offers a little extra load area height than its predecessor, with a maximum height of 1,397mm from floor to ceiling. This compensates for a slightly shorter load bay (2,512mm for the 'L1', 2,862mm for the 'L2') and marginally less width between the wheelarches (now 1.26m). Overall, cargo capacity is slightly improved on the previous model. That means a minimum load volume of 5.3 cubic metres for the 'L1', and 6.1 cubic metres for the 'L2'. This expands to 5.8 and 6.6 cubic metres when the through-load facility is used (standard if you avoid base-spec trim), but this only applies to loads that can fit through the hole in the bulkhead.
The possible payloads you can carry with the 1.5-litre engine are fractionally down on those of the old MK2 1.6-litre model. The feeblest 100PS model can only take on 975kg, while the 120PS manages 1,079kg. The 2.0 Turbo D is better, as it can carry up to 1,458kg in 145PS guise, or up to 1,418kg in the 180PS auto. This is around 200kg more than the previous Vivaro and shows the benefit of the gutsier 2.0-litre diesel.
As for running costs, well the 1.5 120PS variant returns up to 42.1mpg on the WLTP combined cycle and 175g/km of CO2. The 100PS petrol version isn't much different at 42.8mpg and 172g/km, while the 2.0 145PS diesel has a best economy reading of 42.1mpg and 176g/km.
There's also the option of a full-electric Vivaro Electric variant which as a 136hp electric motor and a WLTP driving range of 133 miles in 50kWh form or up to 196 miles in 75kWh guise. Charging via a 7.4kW wall box will take over 7 hours for the 50kWh battery - it's more than 11 hours for the 75kWh unit. If you find a 100kW DC rapid charger when you're out and about, you'll be able to get the smaller battery from near empty to 80% full around half an hour: it'll take around 45 minutes to do the same with the larger capacity unit.