If you think oil prices will only get higher and higher, consider investing in companies that stand to benefit from this. That is, energy companies. In Australia there is Woodside Petroleum, Oil Search, and Santos. Share prices in these companies in the last year have increased more than oil prices.

If you want a managed fund consider the Colonial First State Global Resources Fund, which as the name suggests invests in resource companies all over the world.

I don't do this however because I just have a feeling oil and petrol prices might go down. The future is uncertain.