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its the same usage as your vy
Also depends on how far you drive, obviously.
Stupid asking how much it'll cost you a week since noone here drives exactly how you do and exactly how far you do.
We can tell you how much average consumption is, but that's it, and even that is just a guideline.
It's like people comparing economy across all models of car "I was a car with good economy, at least 400k's a tank" simple, get a friggin prado with 90L+70L subtank, that'll get you 400k's ... agggh.
"how long is a piece of string"