Quote: Fuel economy: 02 van Express 2500 HD work van. Started using Amsoil at 5000 miles. At this time there were no ladder racks or ladders on this van. Fuel mileage was checked on every tank and came in at 10.5 MPG. Changed to Amsoil in the engine and was know getting 11.5 MPG. At 20,000 miles changed trans fuild to Amsoil and increased to 13MPG.
Claims like this are somewhere between misleading and irresponsible. There are too many variables across the mileage checks you've listed, let alone those variables you haven't discussed (ambient temperature, seasonal fuel formulation changes, driving conditions, speeds and routes, and more). There are not two miles per gallon to be picked up by switching to synthetic automatic trans fluid, period. That's a simple matter of physics and math: If there were, the transmission would be dissipating enough energy to turn into a molten heap of slag under the vehicle.
Fortunately for the bottom line of companies like Amsoil (also Slick-50, PIAA, the makers of all those miracle "gas saver" products, the Splitfire spark plug people, the Bosch spark plug people, etc.), the human mind is wired so as to perceive patterns where none exist, to be susceptible to the power of suggestion, and to justify actions that might not make sense if they were subjected to rigourous, scientific scrutiny. It might easily be called the Slick 50 Effect: "I just paid $40 for a bottle of Slick-50...of course my engine runs smoother and quieter and gets 3 more miles per gallon, I checked!"
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Thanks Ron Parker