Just bought a camper van, a Toyota Hiace 2001 2.7 petrol. There is no English manual with this vehicle ...it's in Japanese so I'd like to have an approximate mpg figure....I fear pretty low and what the tyre pressures should be and any other thing that would be useful!

The fuel consumption will be what you get, no paper figure will relate to the real world and your specific use.

The tyre pressures will be pretty much the same as an ordinary Hiace providing the tyres are the same size and load rating.

Another alternative is to learn Japanese.