When we left Edgar & Anna's in Santa Anna, Sonora yesterday, we stopped at the next Pemex on the right headed south #8234. I made sure attendant zeroed out the meter on the diesel, after fueling I noticed pump read 1853 pesos. The attendant wanted to show me something on my opposite front tire, which looked fine to me. He then pulled out a slip saying I owed 2250 for fuel, we went back around to the pump and someone had turned the meter back to zero.. We had a few words, finally got the manager over and he still wanted the 2250. I gave them 1900 and told them that was all. So be careful there...
Same thing happened to me several years ago at a gas station near Frankfurt International Airport, Germany.