I would check air filter, and run overhead... In addition, check tire pressures consistently...And, tire tread can play a difference such as grippper vs. highway design as rolling resistance is key.
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2004 GS Crescendo
350 Cat C7 Acert / MH 3000 Auto
Toad: 2011 Silverado Z71 4x4
Blue Ox Avanti 2
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