A couple weeks ago (Memorial Day Weekend) we travel south of San Felipe and here is part of my trip report that was posted on an other board:
We left Oceanside Saturday morning, crossed into Mexicali about 10:00, got some gas (7.51 pesos per liter, 10.20 pesos per dollar) which meant $2.78/ gallon far better than the $4.10+ gallon north of the border!
The drive south was fast and easy... some pot holes to dodge just north of the Laguna Salada crossing and 4 lanes now go 12.7 miles north from the San Felipe traffic circle.
The new Pemex/ mini market/ ATM is open at El Dorado Ranch, just south of the Rockadile sign. Away from the border region the price of Magna dropped to 6.82 pesos per liter, but the exchange rate was an even 10 pesos per dollar... that still gave us fuel at $2.57/ gallon! Premium was 8.56/ liter, by-the-way