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I would say average is 67mph but some drastic rise/drops in elevation. My best average was 17.7mpg after the level kit and tires with summer blend diesel on the same route and I stop at the same gas station for habit and ease of access/clean bathroom and healthy snacks.
Would it be reasonable to assume the tonneau cover is at lest helping a little with economy considering my best with winter blend was 17.3? This also including some heavily snowed roads, 30mph sections etc? I plan on doing same trip in August time with hopefully only an air dam added.
No fuel additive was used this or last trip but I did notice a very slight improvement with diese kleen if used properly but the benefit didn’t make up for he cost so I only use it couple times a year when I travel through areas with questionable diesel etc.
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