What's the absolute maximum range of your Duster?

cruiser said
Mike, my original owners manual shows a 16 gallon tank. This photo is from page 52 of the manual showing the fuel capacity. In any case, it's a pretty small tank.

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You didn't say in your original post what year Duster you had. I looked up specs on a 70 in factory spec info on the Hamtramck site.