I don't think it will last. I'm skeptical that it'll stay this low for a full year.
I'm going guess it probably has room to fall some more, maybe even to pre-Gulf War range, since we're not at the bottom yet (economy wise). But it'll probably be about $50 mid year.
OPEC has a fine line to walk, cut enough production to keep the price sustainable for their member nations. But if it's too high, the push for alternative energy gets stronger and they'll end up being screwed, since it's their primary source of income.
As long as it stays this low, get out and enjoy driving the 4Runner!
It's totally hard to predict the market now. Good news or bad news can tank or rally the market. It doesn't really follow traditional trends.