I've never thought about it that way, but I think you go wrong when you assume that any gas "saved" through the use of hybrids would increase the use of gas in a land with sub-standard environmental regulations. Those countries will use what they use - unaffected by the fuel efficiency of American vehicles. In other words, if Brazil was going to use X million barrels this month and Americans saved Y million barrels by using hybrids, Brazil wouldn't suddenly decide to use X+Y million barrels.

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Do more to protect the enviroment
In fact, Hybrids are worse for the environment than existing gasoline combustion engines. Follow me here... Hybrids, assuming you are driving them in the city and not the highway, use less gasoline than the average car - or they are at least billed as such. Since they use less gasoline, this means that there is more gasoline available for other users. Since we know from recent price spikes that gasoline is relatively price inelastic in America, the greater the number of hybrids on the road, the less gasoline that is being used by America.
Most people take that to be fact, even your average Joe on the street. I encourage you to tear it apart, since it's the basis for my next paragraph :)
Since America is using less gasoline (hence less petroleum), the same amount of petroleum is available for the rest of the world's use at a cheaper marginal cost than it were when America had 0 hybrids. Since the cost is lower, your average Joe in a developing nation (granted, there are few developing nations where you'd find a guy named Joe) can now buy more Gasoline; since his nation has lower Air Quality and emissions standards than America, you've now taken that 10 gallons a week that was being pushed through your Geo Metro, reduced it to 4 gallons a week for your Prius, and Joe-in-developing-nation is pretty much just burning the 6 gallons out of a barrel.
Awesome. Go hybrids.
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