Lots of variables with that question, but there are two people in our household sharing a 3.2L SUV that does about 18,000Km a year. In the last 12 months the petrol bill came to about 3,500Dhs, or about £50/$80 a month. It will now be 25% higher than that. It won't bankrupt us and it won't stop us going out but it is probably a sign of things to come and has to be factored in to all the other rising costs in Dubai, along with the stagnant wages.
I imagine if you have children to run around you could easily double my fuel bill.