| | Retail Gasoline Prices by Grade by Formulation |
| | . |
| | Chicago, Regular |
| | . |
| | Conventional |
| | Date | | Areas | | RFG Areas | | Average |
| | 06/30/08 | $4.201 | $4.201 |
| | 06/23/08 | $4.216 | $4.216 |
| | 06/16/08 | $4.181 | $4.181 |
| | 06/09/08 | $4.171 | $4.171 |
| | 06/02/08 | $4.176 | $4.176 |
| | 05/26/08 | $4.172 | $4.172 |
| | 05/19/08 | $4.019 | $4.019 |
| | 05/12/08 | $3.944 | $3.944 |
| |
| | Chicago, Midgrade |
| | . |
| | Conventional |
| | Date | | Areas | | RFG Areas | | Average |
| | 06/30/08 | $4.318 | $4.318 |
| | 06/23/08 | $4.325 | $4.325 |
| | 06/16/08 | $4.292 | $4.292 |
| | 06/09/08 | $4.284 | $4.284 |
| | 06/02/08 | $4.289 | $4.289 |
| | 05/26/08 | $4.283 | $4.283 |
| | 05/19/08 | $4.129 | $4.129 |
| | 05/12/08 | $4.059 | $4.059 |
| |
| | Chicago, Premium |
| | . |
| | Conventional |
| | Date | | Areas | | RFG Areas | | Average |
| | 06/30/08 | $4.424 | $4.424 |
| | 06/23/08 | $4.429 | $4.429 |
| | 06/16/08 | $4.399 | $4.399 |
| | 06/09/08 | $4.392 | $4.392 |
| | 06/02/08 | $4.396 | $4.396 |
| | 05/26/08 | $4.390 | $4.390 |
| | 05/19/08 | $4.238 | $4.238 |
| | 05/12/08 | $4.162 | $4.162 |
| |
| | Last Updated 6/30/2008 |