Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

What ETF best tracks the price of gasoline, or else crude oil?
Do not buy any commodity tracking ETF without reading and understanding the prospectus. Some of these things get exposure to the underlying commodity via swaps or other hocus-pocus derivatives, so you're really buying credit obligations from some bank. Others are futures based, and you need to understand your potential upside AND downside. If you think that oil prices are going to continue to rise, you should look into sector funds, or better yet individual stocks that are in the oil or associated businesses. Alternatively, look at alternative investments like natural gas producers or pipeline operators.