Interesting question about the fuel. I have a 1972 Toyota Landcruiser, with the original 6 cylinder. It was designed to run on regular gas. I do not remember when unleaded fuel started being made, but it must have been about this time. The reason I say this, is because in my owner's manual, Toyota includes a note that says that if unleaded fuel is used, it must be 91+ octane. I don't know if that statement is true or not. I have owned the Landcruiser for 12 years. I have always put 91+ octane in it and have had no problems with the engine. It uses no oil and runs like a top. From time to time, I will run it at 65-70 mph. At 70 mph, the engine is really screaming, since the transmission is a 3 speed. I think the rear end is a 3.7. But, I'm not sure.
