Exchange rates have dropped a little, right before I go to japan too. Not long ago $1 AUD was at 104 yen.
Last time I filled up it was $1.50 a litre. It's hard to find places that have high octane fuel without ethanol.
Speed cameras on mobile vans are only allowed to be put in specific places, which are available on the net. So long as you know the streets you know where the fixed cameras are too. Almost all of the cameras have warning signs alerting you to the fact there's one coming up (almost).
+1 for pictures