Interesting. We pulled into the SmartGas south of Los Mochis, on 15 last night. Sadly, I didn't get the full story (my severely limited Spanish), but it seems we had to pay "credito, no cash" .
We wondered if it was a scam of sorts so did not fill up. That incident brought me to this forum. ... Thanks for the info!
We are going to head out this morning and see what happens at the next Fuel Station (fingers crossed). The fellow at the pump did explain it is the same thing at "Pilarica" which I know is the next station 3 km north of us. ....
Will add to this post later ....