Birds, insects, and many reptiles excrete nitrogenous waste in the form of uric acid, which saves water.
Nitrogenous waste in the body tend to form toxic ammonia, which must be excreted. Mammals such as human excrete urea, while birds, reptiles, and some terrestrial invertebrates produce uric acid as waste in the form of a white paste or power. The production of uric acid involves a complex metabolic pathway that is energetically costly in comparison to processing of other nitrogenous wastes such as urea or ammonia, it has the advantages of reducing water loss and, hence, reducing the need for water.
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Petroleum is the primary fuel used for transportation in the US because it has a high energy value per unit volume and it has a quick start and stop times for providing energy. Additionally, petroleum is extremely easy to extract, it is a high density fuel, can also be transported over long distances and provides fuel that works with our infrastructure.