..
A consumers view on cheap oil will always be a simplistic rosy looking view..but the overall view is one of many effects (some which spiral out of control) from a disruptived energy market...You have to tackle the mind straining interactions of networks to learn about Market Physics so to be able to understand, for example, the US Oil investment being only 1% of US GDP, yet the oil declines last year dragged GDP down 0.4 percentage points...
Other simple disruptive effects are..
Cheap petrol prices act as a tax reduction..the Reserve bank or FED may not like not having no control on this easing of the money supply to the masses..It creates problems as to how to tighten the money supply during cheap oils deflationary effect on the economy.....
Currency devaluations upsets from Oil producing nations...
Supply/demand gets screwed up
etc
etc
Then there's the socio-economic effects...Countries in dire straits tend to do dumb things...People do dumb things like assume cheap oil is forever and financially over commit..
Yes there will be winners...some economists think it may benefit the EU community.
NZ cheap prices not happening....Don't expect government to apply the pressure...the government takes about $1/litre in various taxes..
see here for the cost breakdown for 91 octane (AA analysis)