Well firstly, just saying that "Exchange rates having nothing to do with oil prices" is rubbish, we are a net importer of oil, most international oil purchases/exchanges are done in US dollars, hence therefore, if the AUD is stronger against the USD, then we achieve a higher buying power per dollar. It makes imports generally more affordable, fuel is no exception from this rule.
Secondly, we really don't get charged that much, ever been to Europe??? They were paying $2.00 a litre when we were paying $0.70... If anything, having too low taxes in the USA and Australia have made us extremely dependend on oil and hasn't forced us to become more energy efficient... We never had to be, now we do, and we aren't ready..