Which statement about MTBE is correct?

The statement that MTBE is only found in gasoline is accurate because MTBE, or methyl tert-butyl ether, is primarily used as an oxygenate in fuel to improve combustion efficiency and reduce emissions in gasoline. It was commonly added to gasoline in the United States to help meet environmental regulations regarding air quality, especially during the 1990s. The use of MTBE in diesel fuels is not typical, which reinforces the specificity of this statement.

In the context of heating oil tanks and environmental monitoring, understanding the associations of various contaminants with specific fuel types is crucial for compliance and safety. Since MTBE is not associated with diesel, this further validates that the correct statement focuses solely on its presence in gasoline. The other statements involve misconceptions regarding the properties and testing protocols for MTBE, highlighting the necessity of being well-versed in fuel compositions and potential contaminants when dealing with heating oil and environmental assessments.