Scams at gas stations

Chris: Almost every time an attendant will tell you the pump is zeroed and ask you to look at the pump. I have never gotten out of the car and yelled. I do look at my bills carefully and dont take off until he walks away or puts the bills in his pouch/pocket. I avoid stations where people have reported problems. I also ask for my fuel in Spanish. But if some loud Gringo greets the attendant rudely I think it would be a different story. Because I am travelling the same routes I fuel up at the same stations. But over the years I have had problems 3 times. Once was in 1985 in my Wife's van. We were at a large Pemex outside tepic. I was young and naive!They still had those pumps that could be rigged to keep the old total on the pump. He showed me the pump and the litres were way more than the capacity of the tank. I got nasty with him and gave him enough to cover the cost of what I estimated it would hold. I took off! Another time in HMO a guy tried the bill switch. I had counted my money that morning and knew exactly which bills I had. When he showed me the 50 peso note I did raise my voice. He insisted so I went and got the manager. I then got in my truck and took off. It seems the problems happen at stations on the highways where Gringos travel. But short fuel amounts still happen. El Imparcial does a story on this once in awhile.