I managed to get above 30 in my 3.0 Vulcan Taurus. The sweet spot for that car was 60MPH. Went on a long trip a few years ago (NY to Alabama and back), experimented for about 650 miles ... set the cruise control at 60. Got 34MPG at a steady 60.
Also, if yours has a Vulcan engine, it should have 3.99 gearing whereas my 01 vulcan had 3.77 gearing. It wouldn't make a huge difference, but a bit of a difference.
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