# Petroleum & Other Liquids

## Gasoline and Diesel Fuel Update

**Gasoline Release Date:** January 26, 2015 | ** Next Release Date: **
February 2, 2015

**Diesel Fuel Release Date:** January 26, 2015 | ** Next Release Date: **
February 2, 2015

## Definition of the Coefficient of Variation

The Coefficient of Variation (CV) of the mean, a measurement of variability of the mean price, is calculated as the standard error divided by the mean. As a measure of precision reflecting the error due to sampling, it can also be used to construct a confidence interval for the population mean. For example, a mean price of $1.67 and a CV of 0.004 (.4%) indicates at the 95% confidence level that the population mean price has an upper limit of $1.68 ($1.67 + 1.96*0.004*$1.67) and a lower limit of $1.66 ($1.67 - 1.96*0.004*$1.67).

#### Detailed Price and CV Report

Motor Gasoline Prices & Coefficients of Variation Spreadsheet

#### Procedures & Methodology

** Gasoline**

Data collection procedures

Sampling methodology

Coefficient of variation

Map of reformulated gasoline

Map of states in each region

NYC Metro Area Counties

**Diesel**

Data collection procedures

Sampling methodology

Coefficient of variation

Map of states in each region

**Gasoline and Diesel**

Federal and state motor fuel taxes

Pump methodology

Gasoline pump data history

Diesel fuel pump data history