The yellow one on the wikipedia page is like mine.
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The one I had was also a yellow one. The color was a pure bright yellow. It looked great against the black targa top and black bumpers.
At the start of the gas crisis in late ‘71(?) we went across five states coming back to KC from San Diego without getting gas or letting my wife get out to pee. It was a 16.5 gallon tank and we were getting over 30mpg.