What's the absolute maximum range of your Duster?

RustyRatRod said

It depends on "which slant" you're talking about. The 170 is a gas miser.

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Absolutely, and revs nice also. Mine would get close to 30. But that was highway cruising, and of course it was not stock. For the OP get a vacuum gage and learn to use it as a mpg tool.